For voice lines you ship in a game, the plan matters more than the brand: ElevenLabs, Fish Audio, WellSaid, and Altered all make their free tiers non-commercial. The cheapest monthly plans here that list a commercial license are Cartesia Pro at $5/month and ElevenLabs Starter at $6/month; Inworld's pay-as-you-go plan also lists one, at $0 to start plus per-character usage. Piper is free and runs locally, but each voice has its own license and its docs say it is meant for personal use and research. Cloning someone's voice needs their consent under ElevenLabs' and Altered's rules. Unity and Godot both import WAV, Ogg Vorbis, and MP3.
Whether an AI voice line can go in a game you sell depends on the plan you made it on, whose voice it is, and the voice model's license. This roundup quotes each vendor's pricing page and terms for all three, then shows how the files get into Unity and Godot, citing the engines' own docs.
Not tested hands-on. We have not tested these tools hands-on, and we have not listened to or compared their voices, so nothing here is ranked on voice quality, realism, or speed. Every claim is a verbatim quote from the vendor's pricing page, terms, or docs, or from Unity, Godot, or Steam documentation, copied on 2026-10-24 or earlier, and our daily job re-checks that each quote is still there. Prices are list prices as quoted, before tax.
7 tools · 22 Unity, Godot, Steam, and vendor doc quotes plus ledger rows · updated 2026-10-24 · last checked 2026-10-24
Text to speech and voice cloning you use in a web app or through an API. Credits and minutes are the vendors' own units; they are not comparable one to one.
Text to speech, voice design, and voice cloning, plus sound effects and music in the same account. Starter is the first plan that lists the Commercial License and Instant Voice Cloning. 44.1kHz PCM output via the API is listed from Pro up.
Monthly price and included credits per plan: Free $0 (10,000 credits); Starter $6 (30,000 credits);ElevenLabs · Verified · fetched 2026-10-22 · elevenlabs.io/pricing
Everything in free, plus Commercial License Instant Voice Cloning 20 Projects in Studio Music commercial useElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/pricing
Sound Effects Voice Design Music Productions Image 3 Projects in Studio 10k credits per monthElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/pricing
if you access or use our Services free of charge (such a user, a “ Free User ”), you may only use the Services for non-commercial purposes; (ii) if you access or use our Services through a paid subscription plan (such a user, a “ Paid User ”), you may use the Services for commercial purposesElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Everything in Creator, plus 44.1kHz PCM audio output via API 192kbps quality audioElevenLabs · Verified · fetched 2026-10-19 · elevenlabs.io/pricing
Text to speech and voice cloning. Paid users are licensed for commercial use, and Fish Audio's FAQ limits commercial use to verified voices that you own. Its terms say content may be used to train its models.
Free Tier Experience realistic AI voice technology. $ 0 mo No credit card needed Sign Up for Free 8,000 credits monthly Up to 7 minutes generation Up to 500 characters per generation 3 public voice slots Standard generation speed Enhanced voice cloning Commercial use Plus You save $48 For creators and professionals. $ 11 mo $ 15 $132 billed annually Upgrade to Plus 250,000 credits monthly Up to 200 minutes generationFish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
Notwithstanding the foregoing, if you are a user of Paid Services, you are licensed to use the Services for commercial uses and otherwise to the fullest extent possible under applicable lawFish Audio · Verified · fetched 2026-10-24 · fish.audio/terms/
Premium subscribers can use verified voices (that you own) for commercial purposes. Free plan users can only use generated content for personal, non-commercial projects.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
Usage Data and Content may be used to develop, train, or enhance artificial intelligence or machine learning models that are part of Fish.Audio’s products and servicesFish Audio · Verified · fetched 2026-10-24 · fish.audio/terms/
Text to speech API. Pro lists a commercial use license and instant voice cloning. Cartesia's API reference shows a WAV (PCM, 44.1 kHz) output format.
Pro $5 /mo Select Pro 100K credits / month $5 prepaid agents / month Everything in Free, plus ✓ Commercial use license ✓ Instant voice cloning Startup $49 /mo Select Startup 1.25M credits / month $49 prepaid agents / month Everything in Pro, plus ✓ Pro voice cloning ✓ Organizations Scale $299 /moCartesia · Verified · fetched 2026-10-15 · cartesia.ai/pricing
Everything in Free, plus ✓ Commercial use licenseCartesia · Verified · fetched 2026-10-15 · cartesia.ai/pricing
Free $0 /mo Start free 20K credits / monthCartesia · Verified · fetched 2026-10-15 · cartesia.ai/pricing
"output_format": { "container": "wav", "encoding": "pcm_s16le", "sample_rate": 44100 }Verified · fetched 2026-10-24 · docs.cartesia.ai/api-reference/tts/bytes
Voiceover studio priced by download minutes. Its export-formats row lists MP3 for some plans and MP3, WAV, and OGG for others, so check the plan before you buy. Paid plans list full commercial rights.
Starter $19 /mo Billed monthly Get started with voiceover Choose Starter 20 minutes/month downloaded audioWellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Starter $10 /mo Save 47% Save $108/yr Billed annually at $120/yearWellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Unlimited generation 10 projects All English voices Full commercial rightsWellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Trial Free No credit card required Try for free Discover WellSaid and our best-in-class voice tools Create your first voiceover in minutes 3 download minutes per month (no commercial rights)WellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Export formats Download your audio in multiple formats MP3 MP3 MP3, TXT MP3, WAV, OGG, TXT MP3, WAV, OGG, TXTWellSaid · Verified · fetched 2026-10-20 · wellsaidlabs.com/pricing/
Voice tools with a desktop app that needs an 8GB+ Nvidia GPU. The Creator license covers commercial use only for teams of up to 5 people with under $100k revenue or funding in 12 months; Altered keeps ownership of its Voices.
Creator $ 30 excl. Tax per month billed annually Creator LicenseAltered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
If You are not eligible for a creator licence then You must purchase a Subscription plan with a standard commercial licence in order to use Your Outputs commercially. Creator Licence: The creator license applies to individuals or companies with up to 5 employees. It allows commercial use of the Outputs as long as the overall revenue or funding from relevant activities is below $100k over the last 12 months.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
Professional $ 90 excl. Tax per month billed annually Commercial License The commercial License allows commercial use of the OutputsAltered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
Free $ 0 Attribution License The attribution License allows users to publish the Outputs in third party platforms provided that they 1) do not use them for commercial purposes and 2) credit Altered for the generated content by mentioning the website (www.altered.ai) in the description or other relevant field.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
You are licensed to use the Output in Projects that You distribute on digital platforms or other media, but the Company retains full ownership of the Voices. You may not claim ownership of the Voices through any content detection and/or registration system (such as YouTube’s Content ID or Facebook Rights Manager), even if synchronised with Your own Project. You may not do or permit the Service or the Outputs to be used to train any algorithm, artificial intelligence algorithm, speech synthesis systemAltered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
Minimum requirements for Desktop version: Windows PC with 8GB+ Nvidia GPU (GTX 1080, RTX 2070, RTX 3050 or greater).Altered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
Text to speech API billed per character; Inworld's site lists games among its solutions. Its terms assign Outputs to you but license the service solely for your internal business purposes, so read the terms before shipping a game that calls it live.
you retain any right, title, and interest that you have in the Inputs you submit. Subject to your compliance with our Terms, we assign to you all of our right, title, and interest in Outputs.Inworld · Verified · fetched 2026-10-15 · inworld.ai/terms
Inworld AI grants you a limited, non-exclusive, non-transferable, non-sublicensable license to access and use the Services and Models solely for your internal business purposes and as permitted by the documentation.Inworld · Verified · fetched 2026-10-15 · inworld.ai/terms
On-Demand Evaluation and prototyping $0 pay as you go TTS-2 $25/1M chars TTS-2 Flash $15/1M charsVerified · fetched 2026-10-24 · inworld.ai/pricing
Up to 70 min TTS included 100 custom voices 2 professional voice clones Voice cloning & voice design Speech-to-Speech access 100+ LLM models via Inworld Inference Commercial licenseVerified · fetched 2026-10-24 · inworld.ai/pricing
Creator Content creation and small projects $25 /mo TTS-2 $25 $20/1M charsVerified · fetched 2026-10-24 · inworld.ai/pricing
Games and media Voices and live dialogue for games and narrated mediaVerified · fetched 2026-10-24 · inworld.ai/pricing
Runs on your own machine with no account. The license question moves from the plan to the voice model.
Open-source text to speech that runs locally; the command line writes a WAV file. The engine is GPL-3.0-or-later, every voice has its own license in its MODEL_CARD, and Piper's docs say it is intended for personal use and research.
A fast and local neural text-to-speech engine that embeds espeak-ng for phonemization. Install with: pip install piper-ttsPiper · Verified · fetched 2026-10-22 · github.com/OHF-Voice/piper1-gpl
url="http://github.com/OHF-voice/piper1-gpl", license="GPL-3.0-or-later",Piper · Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/setup.py
The `MODEL_CARD` file for each voice contains important licensing information. Piper is intended for personal use and text to speech research only; we do not impose any additional restrictions on voice models. Some voices may have restrictive licenses, however, so please review them carefully!Piper · Verified · fetched 2026-10-22 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/VOICES.md
* License: CC0 ## Training Finetuned from U.S. English lessac voice (medium quality).Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/joe/medium/MODEL
* URL: http://www.openslr.org/60/ * License: CC BY 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/libritts/high/MO
* URL: https://www.kaggle.com/datasets/roholazandie/ryanspeech * License: CC BY-NC-SA 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/ryan/high/MODEL_
This will write `test.wav` with the sentence "This is a test."Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/CLI.md
Can you ship it? is the label from each tool's commercial-use page, computed from its stored vendor quotes. Unverified means we have no commercial-use quote yet, not that the answer is no. Prices are copied from vendor quotes; open the tool's page for the exact plan text. Untested: we have not generated or listened to audio from any of these tools.
This is the part that decides whether a voice line can go in a game you sell. The short version: most free tiers here are non-commercial, so a free plan is for prototyping, not for the lines you ship.
ElevenLabs' terms say free users may only use the service for non-commercial purposes and paid users may use it commercially. Fish Audio's free plan is for personal, non-commercial projects. WellSaid's trial has no commercial rights. Altered's free tier is an attribution license that rules out commercial use and requires crediting Altered. Cartesia lists its commercial use license on Pro ($5/month), not on Free.
if you access or use our Services free of charge (such a user, a “ Free User ”), you may only use the Services for non-commercial purposes; (ii) if you access or use our Services through a paid subscription plan (such a user, a “ Paid User ”), you may use the Services for commercial purposesElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Premium subscribers can use verified voices (that you own) for commercial purposes. Free plan users can only use generated content for personal, non-commercial projects.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
3 download minutes per month (no commercial rights)WellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Free $ 0 Attribution License The attribution License allows users to publish the Outputs in third party platforms provided that they 1) do not use them for commercial purposes and 2) credit Altered for the generated content by mentioning the website (www.altered.ai) in the description or other relevant field.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
Everything in Free, plus ✓ Commercial use licenseCartesia · Verified · fetched 2026-10-15 · cartesia.ai/pricing
Inworld's On-Demand plan is $0 to start and pay as you go, and its plan card lists a commercial license; you pay per character, and Inworld's terms license the service solely for your internal business purposes. Piper costs nothing, but its docs say it is intended for personal use and research, and each voice carries its own license: the Joe voice is CC0, the LibriTTS voice is CC BY 4.0 (which requires attribution), and the Ryan voice is CC BY-NC-SA 4.0 (non-commercial).
Commercial license Community support Choose On-DemandInworld · Verified · fetched 2026-10-15 · inworld.ai/pricing
Inworld AI grants you a limited, non-exclusive, non-transferable, non-sublicensable license to access and use the Services and Models solely for your internal business purposes and as permitted by the documentation.Inworld · Verified · fetched 2026-10-15 · inworld.ai/terms
The `MODEL_CARD` file for each voice contains important licensing information. Piper is intended for personal use and text to speech research only; we do not impose any additional restrictions on voice models. Some voices may have restrictive licenses, however, so please review them carefully!Piper · Verified · fetched 2026-10-22 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/VOICES.md
* License: CC0 ## Training Finetuned from U.S. English lessac voice (medium quality).Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/joe/medium/MODEL
* URL: http://www.openslr.org/60/ * License: CC BY 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/libritts/high/MO
* URL: https://www.kaggle.com/datasets/roholazandie/ryanspeech * License: CC BY-NC-SA 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/ryan/high/MODEL_
On-Demand Evaluation and prototyping $0 pay as you go TTS-2 $25/1M chars TTS-2 Flash $15/1M charsVerified · fetched 2026-10-24 · inworld.ai/pricing
ElevenLabs' terms say that, as between you and ElevenLabs, you retain all rights in your Output. Inworld's terms assign Outputs to you, subject to its terms. Altered says it makes no claim to ownership of Outputs but keeps full ownership of its Voices, and you may not register them with content detection systems such as YouTube's Content ID. We have no verified ownership quote for Fish Audio, Cartesia, WellSaid, or Piper, so those show as unverified on their tool pages.
as between you and ElevenLabs, you retain all rights in and to your Input. (ii) For the avoidance of doubt, Output may be generated by, but does not include, ElevenLabs’ foundational and other artificial intelligence voice models (the “ Voice Models ”) or ElevenLabs’ foundational and other artificial intelligence or language learning models (“ LLMs ”) (Voice Models and LLMs, collectively, the “ Models ”). Except as expressly set forth herein, as between you and ElevenLabs, you retain all rights in and to your Output.ElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
you retain any right, title, and interest that you have in the Inputs you submit. Subject to your compliance with our Terms, we assign to you all of our right, title, and interest in Outputs.Inworld · Verified · fetched 2026-10-15 · inworld.ai/terms
You shall retain ownership of the Content in its original form. The Company does not make any claim to ownership of or rights in the Outputs or the Project other than as contemplated by these Terms and Conditions.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
You are licensed to use the Output in Projects that You distribute on digital platforms or other media, but the Company retains full ownership of the Voices. You may not claim ownership of the Voices through any content detection and/or registration system (such as YouTube’s Content ID or Facebook Rights Manager), even if synchronised with Your own Project. You may not do or permit the Service or the Outputs to be used to train any algorithm, artificial intelligence algorithm, speech synthesis systemAltered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
Altered's Creator license covers individuals or companies with up to 5 employees and under $100k revenue or funding from relevant activities over 12 months. ElevenLabs has separate terms for the EEA, Switzerland, and the UK. Fish Audio's terms say content may be used to train its models, and ElevenLabs' terms give it a license to use voice content you upload to improve its services. Altered's terms bar using its Outputs to train other AI systems.
If You are not eligible for a creator licence then You must purchase a Subscription plan with a standard commercial licence in order to use Your Outputs commercially. Creator Licence: The creator license applies to individuals or companies with up to 5 employees. It allows commercial use of the Outputs as long as the overall revenue or funding from relevant activities is below $100k over the last 12 months.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
These ElevenLabs Terms of Service apply if you reside outside of the European Economic Area (EEA), Switzerland, or UK. If you live in the EEA, Switzerland, or UK, these other ElevenLabs Terms of Service apply to you.ElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Usage Data and Content may be used to develop, train, or enhance artificial intelligence or machine learning models that are part of Fish.Audio’s products and servicesFish Audio · Verified · fetched 2026-10-24 · fish.audio/terms/
You are licensed to use the Output in Projects that You distribute on digital platforms or other media, but the Company retains full ownership of the Voices. You may not claim ownership of the Voices through any content detection and/or registration system (such as YouTube’s Content ID or Facebook Rights Manager), even if synchronised with Your own Project. You may not do or permit the Service or the Outputs to be used to train any algorithm, artificial intelligence algorithm, speech synthesis systemAltered Studio · Verified · fetched 2026-10-22 · altered.ai/terms-and-conditions.html
to the extent that your Content includes your voice, the foregoing license allows ElevenLabs to reproduce, modify, publish, create derivative works from, distribute, publicly or otherwise perform, and use your voice, and other indicia of your persona that may be contained therein, to provide and improve the Services, and to develop new services and products.Verified · fetched 2026-10-24 · elevenlabs.io/terms-of-use
The Piper engine is GPL-3.0-or-later, but the voice model is what you ship audio from. The Lessac voice used in Piper's own command-line example points to a Blizzard 2013 license that excludes using the materials for any commercial purpose. The Joe voice is CC0 but was finetuned from the Lessac voice; we have not found a source that settles whether the Lessac terms carry over, so treat it with care.
url="http://github.com/OHF-voice/piper1-gpl", license="GPL-3.0-or-later",Piper · Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/setup.py
* License: https://www.cstr.ed.ac.uk/projects/blizzard/2013/lessac_blizzard2013/license.html ## Training Trained from scratch.Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/lessac/medium/MO
excludes loading, executing, storing, transmitting, displaying, copying, reverse engineering, developing, adapting, amending or otherwise using the Materials for any commercial purposePiper · Verified · fetched 2026-10-22 · cstr.ed.ac.uk/projects/blizzard/2013/lessac_blizzard2013/license.html
* License: CC0 ## Training Finetuned from U.S. English lessac voice (medium quality).Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/joe/medium/MODEL
This will write `test.wav` with the sentence "This is a test."Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/CLI.md
Voice cloning is where game projects most easily get into trouble. These are the vendors' own rules; they are not legal advice.
ElevenLabs' prohibited use policy bans cloning or impersonating the voice of any living person without their explicit and informed consent or other valid authorization, and its terms describe voice models as your voice or a voice you are authorized to share. Altered's terms say that if you are not the speaker in the source recording, you must have the speaker's consent. Fish Audio's FAQ limits commercial use to verified voices that you own.
Premium subscribers can use verified voices (that you own) for commercial purposes. Free plan users can only use generated content for personal, non-commercial projects.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
Cloning, synthesizing, or impersonating the voice, identity, or likeness of any living individual without their explicit and informed consent or other valid authorizationVerified · fetched 2026-10-24 · elevenlabs.io/use-policy
Some of our Services allow you to create a voice model that can be used to generate Output in the form of synthetic audio sounding like your voice or a voice you are authorized to share with usVerified · fetched 2026-10-24 · elevenlabs.io/terms-of-use
In order to create a Custom Voice, You must hold the rights to use the Source Voice to create and use the Custom Voice. If You are not the speaker in Source Voice recording then You must have the consent of the person speaking.Verified · fetched 2026-10-24 · altered.ai/terms-and-conditions.html
ElevenLabs' policy says you may not submit voice recordings of anyone under 18 to create or train a voice model. If a child character needs a voice, a designed or stock voice avoids this.
You may not submit voice recordings of anyone under 18 to create or train a voice model.Verified · fetched 2026-10-24 · elevenlabs.io/use-policy
Our advice, not a vendor rule: if you clone an actor, get their written agreement that covers synthetic use, which lines, and for how long, before you upload a recording. The vendor rules above put the burden of having that permission on you.
Cloning, synthesizing, or impersonating the voice, identity, or likeness of any living individual without their explicit and informed consent or other valid authorizationVerified · fetched 2026-10-24 · elevenlabs.io/use-policy
In order to create a Custom Voice, You must hold the rights to use the Source Voice to create and use the Custom Voice. If You are not the speaker in Source Voice recording then You must have the consent of the person speaking.Verified · fetched 2026-10-24 · altered.ai/terms-and-conditions.html
None of the vendor pages we quote here names Unity or Godot, so the useful question is the file format. Both engines import WAV, Ogg Vorbis, and MP3.
WellSaid's export-formats row lists MP3 on some plans and MP3, WAV, and OGG on others. ElevenLabs lists 44.1kHz PCM audio via the API from Pro up. Cartesia's API reference shows a WAV container with 16-bit PCM at 44,100 Hz. Piper's command line writes a WAV file. Fish Audio's API is for premium subscribers. We have no verified export quote for Altered beyond its desktop GPU requirement, or for Inworld.
Export formats Download your audio in multiple formats MP3 MP3 MP3, TXT MP3, WAV, OGG, TXT MP3, WAV, OGG, TXTWellSaid · Verified · fetched 2026-10-20 · wellsaidlabs.com/pricing/
Everything in Creator, plus 44.1kHz PCM audio output via API 192kbps quality audioElevenLabs · Verified · fetched 2026-10-19 · elevenlabs.io/pricing
Premium subscribers get access to our flexible pay-as-you-go API.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
Minimum requirements for Desktop version: Windows PC with 8GB+ Nvidia GPU (GTX 1080, RTX 2070, RTX 3050 or greater).Altered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
"output_format": { "container": "wav", "encoding": "pcm_s16le", "sample_rate": 44100 }Verified · fetched 2026-10-24 · docs.cartesia.ai/api-reference/tts/bytes
This will write `test.wav` with the sentence "This is a test."Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/CLI.md
Unity imports .mp3, .aiff/.aif, .wav, .ogg, and .flac. Drag the file into the Project window and Unity imports it as an Audio Clip. Unity's docs say speech can be set to load on demand or as the player progresses; Force To Mono mixes multi-channel audio down to mono, and Vorbis/MP3 compression gives smaller files at lower quality than PCM.
You can import the following audio file formats into Unity: Format Extensions MPEG layer 3 .mp3 Audio Interchange File Format .aiff / .aif Microsoft Wave .wav Ogg Vorbis .ogg Free Lossless Audio Codec (FLAC) .flacVerified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-compatibility.html
Click and drag your file into your open Unity project Project window. Unity imports your audio file into your project as an Audio Clip.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-import.html
For other assets, such as speech, background music, or ambient loops, you can set them to load on-demand or as the player progresses.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-introduction.html
Force To Mono Enable to mix multi-channel audio down to a mono track before packing occurs.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/class-AudioClip.html
Vorbis/MP3 - Choose this compression to create smaller files but lower quality audio compared to PCM audio.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/class-AudioClip.html
Godot imports WAV, Ogg Vorbis, and MP3. Its docs say voices can generally be converted to mono and have their sample rate reduced to 22 kHz without a noticeable loss in quality, unless the voice is very high-pitched. AudioStreamPlayer plays sound non-positionally; for a character speaking at a position in the world, Godot points you to AudioStreamPlayer2D or AudioStreamPlayer3D.
Godot provides 3 options to import your audio data: WAV, Ogg Vorbis and MP3.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
Voices can generally be converted to mono, but can also have their sample rate reduced to 22 kHz without a noticeable loss in quality (unless the voice is very high-pitched).Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
Ogg Vorbis files use a stronger compression that results in much smaller file size, but require significantly more processing power to play back.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
The AudioStreamPlayer node plays an audio stream non-positionally. It is ideal for user interfaces, menus, or background music.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/classes/class_audiostreamplayer.html
If you need to play audio at a specific position, use AudioStreamPlayer2D or AudioStreamPlayer3D instead.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/classes/class_audiostreamplayer.html
Steam's content survey treats voice lines you generate during development and ship as Pre-Generated AI content, and speech generated while the game runs as Live-Generated, which adds a question about the guardrails you use. Steam's FAQ also covers live AI services that cost money for each input and output, which is how Inworld's per-character pricing works.
Pre-Generated: Any kind of content that ships with your game and is consumed by players that is created with the help of AI tools during development.ElevenLabs · Verified · fetched 2026-10-15 · partner.steamgames.com/doc/gettingstarted/contentsurvey
Live-Generated: Any kind of content created with the help of AI tools while the game is running. In addition to following the same rules as Pre-Generated AI content, this comes with an additional requirement - in the Content Survey, you'll need to tell us what kind of guardrails you're putting on your AI to ensure it's not generating illegal content.Inworld · Verified · fetched 2026-10-15 · partner.steamgames.com/doc/gettingstarted/contentsurvey
My game connects to a Live-Generated AI service, which incurs ongoing costs for each input/output. What should I do?Verified · fetched 2026-10-24 · partner.steamgames.com/doc/gettingstarted/contentsurvey
On-Demand Evaluation and prototyping $0 pay as you go TTS-2 $25/1M chars TTS-2 Flash $15/1M charsVerified · fetched 2026-10-24 · inworld.ai/pricing
Editorial opinion
These picks are our editorial opinion, based on the quoted prices and terms above. We have not used these tools to voice a game and have not compared how they sound, so we don't rank them on quality.
Everything in free, plus Commercial License Instant Voice Cloning 20 Projects in Studio Music commercial useElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/pricing
Everything in Free, plus ✓ Commercial use licenseCartesia · Verified · fetched 2026-10-15 · cartesia.ai/pricing
Unlimited generation 10 projects All English voices Full commercial rightsWellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
The `MODEL_CARD` file for each voice contains important licensing information. Piper is intended for personal use and text to speech research only; we do not impose any additional restrictions on voice models. Some voices may have restrictive licenses, however, so please review them carefully!Piper · Verified · fetched 2026-10-22 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/VOICES.md
if you access or use our Services free of charge (such a user, a “ Free User ”), you may only use the Services for non-commercial purposes; (ii) if you access or use our Services through a paid subscription plan (such a user, a “ Paid User ”), you may use the Services for commercial purposesElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Premium subscribers can use verified voices (that you own) for commercial purposes. Free plan users can only use generated content for personal, non-commercial projects.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
3 download minutes per month (no commercial rights)WellSaid · Verified · fetched 2026-10-19 · wellsaidlabs.com/pricing/
Free $ 0 Attribution License The attribution License allows users to publish the Outputs in third party platforms provided that they 1) do not use them for commercial purposes and 2) credit Altered for the generated content by mentioning the website (www.altered.ai) in the description or other relevant field.Altered Studio · Verified · fetched 2026-10-22 · altered.ai/pricing/
Commercial license Community support Choose On-DemandInworld · Verified · fetched 2026-10-15 · inworld.ai/pricing
The `MODEL_CARD` file for each voice contains important licensing information. Piper is intended for personal use and text to speech research only; we do not impose any additional restrictions on voice models. Some voices may have restrictive licenses, however, so please review them carefully!Piper · Verified · fetched 2026-10-22 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/VOICES.md
* License: CC0 ## Training Finetuned from U.S. English lessac voice (medium quality).Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/joe/medium/MODEL
On-Demand Evaluation and prototyping $0 pay as you go TTS-2 $25/1M chars TTS-2 Flash $15/1M charsVerified · fetched 2026-10-24 · inworld.ai/pricing
if you access or use our Services free of charge (such a user, a “ Free User ”), you may only use the Services for non-commercial purposes; (ii) if you access or use our Services through a paid subscription plan (such a user, a “ Paid User ”), you may use the Services for commercial purposesElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Everything in free, plus Commercial License Instant Voice Cloning 20 Projects in Studio Music commercial useElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/pricing
as between you and ElevenLabs, you retain all rights in and to your Input. (ii) For the avoidance of doubt, Output may be generated by, but does not include, ElevenLabs’ foundational and other artificial intelligence voice models (the “ Voice Models ”) or ElevenLabs’ foundational and other artificial intelligence or language learning models (“ LLMs ”) (Voice Models and LLMs, collectively, the “ Models ”). Except as expressly set forth herein, as between you and ElevenLabs, you retain all rights in and to your Output.ElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
These ElevenLabs Terms of Service apply if you reside outside of the European Economic Area (EEA), Switzerland, or UK. If you live in the EEA, Switzerland, or UK, these other ElevenLabs Terms of Service apply to you.ElevenLabs · Verified · fetched 2026-10-15 · elevenlabs.io/terms-of-use
Premium subscribers can use verified voices (that you own) for commercial purposes. Free plan users can only use generated content for personal, non-commercial projects.Fish Audio · Verified · fetched 2026-10-24 · fish.audio/plan/
Cloning, synthesizing, or impersonating the voice, identity, or likeness of any living individual without their explicit and informed consent or other valid authorizationVerified · fetched 2026-10-24 · elevenlabs.io/use-policy
In order to create a Custom Voice, You must hold the rights to use the Source Voice to create and use the Custom Voice. If You are not the speaker in Source Voice recording then You must have the consent of the person speaking.Verified · fetched 2026-10-24 · altered.ai/terms-and-conditions.html
Click and drag your file into your open Unity project Project window. Unity imports your audio file into your project as an Audio Clip.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-import.html
You can import the following audio file formats into Unity: Format Extensions MPEG layer 3 .mp3 Audio Interchange File Format .aiff / .aif Microsoft Wave .wav Ogg Vorbis .ogg Free Lossless Audio Codec (FLAC) .flacVerified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-compatibility.html
For other assets, such as speech, background music, or ambient loops, you can set them to load on-demand or as the player progresses.Verified · fetched 2026-10-24 · docs.unity3d.com/Manual/AudioFiles-introduction.html
Godot provides 3 options to import your audio data: WAV, Ogg Vorbis and MP3.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
Ogg Vorbis files use a stronger compression that results in much smaller file size, but require significantly more processing power to play back.Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
Voices can generally be converted to mono, but can also have their sample rate reduced to 22 kHz without a noticeable loss in quality (unless the voice is very high-pitched).Verified · fetched 2026-10-24 · docs.godotengine.org/en/stable/tutorials/assets_pipeline/importing_aud
Pre-Generated: Any kind of content that ships with your game and is consumed by players that is created with the help of AI tools during development.ElevenLabs · Verified · fetched 2026-10-15 · partner.steamgames.com/doc/gettingstarted/contentsurvey
Live-Generated: Any kind of content created with the help of AI tools while the game is running. In addition to following the same rules as Pre-Generated AI content, this comes with an additional requirement - in the Content Survey, you'll need to tell us what kind of guardrails you're putting on your AI to ensure it's not generating illegal content.Inworld · Verified · fetched 2026-10-15 · partner.steamgames.com/doc/gettingstarted/contentsurvey
A fast and local neural text-to-speech engine that embeds espeak-ng for phonemization. Install with: pip install piper-ttsPiper · Verified · fetched 2026-10-22 · github.com/OHF-Voice/piper1-gpl
url="http://github.com/OHF-voice/piper1-gpl", license="GPL-3.0-or-later",Piper · Verified · fetched 2026-10-24 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/setup.py
The `MODEL_CARD` file for each voice contains important licensing information. Piper is intended for personal use and text to speech research only; we do not impose any additional restrictions on voice models. Some voices may have restrictive licenses, however, so please review them carefully!Piper · Verified · fetched 2026-10-22 · raw.githubusercontent.com/OHF-Voice/piper1-gpl/main/docs/VOICES.md
* URL: https://www.kaggle.com/datasets/roholazandie/ryanspeech * License: CC BY-NC-SA 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/ryan/high/MODEL_
excludes loading, executing, storing, transmitting, displaying, copying, reverse engineering, developing, adapting, amending or otherwise using the Materials for any commercial purposePiper · Verified · fetched 2026-10-22 · cstr.ed.ac.uk/projects/blizzard/2013/lessac_blizzard2013/license.html
* URL: http://www.openslr.org/60/ * License: CC BY 4.0Piper · Verified · fetched 2026-10-22 · huggingface.co/rhasspy/piper-voices/raw/main/en/en_US/libritts/high/MO
We email when our daily check finds a pricing or terms change on a tool we track, the same entries as the change log.