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Agents tracked: 378 Downloads (7d): 244M down 5.7% GitHub stars: 8.4M VS Code installs: 151M Releases (7d): 407 Agent status: 1 with issues Updated Oct 10, 2026
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Piper by Open Home Foundation

Fast local TTS engine (GPL-3.0) with downloadable voices under per-voice licenses.

Voiceover (text-to-speech) Open source

Website License API docs

Price
Free
Self-hosted; compute only (fast on CPU).
Commercial use
With conditions
GPL-3.0 (engine); per-voice model licenses
Credit the author
Per item
Credit depends on the item
Agent access
Package (npm/PyPI)

Rules for your agent

- Piper (Voiceover (text-to-speech)). Fast local TTS engine (GPL-3.0) with downloadable voices under per-voice licenses. Price: free; commercial use with conditions; credit depends on the item; ship inside your app with conditions.
  Connect: PyPI piper-tts.
  Rule: Meet GPL-3.0 obligations if you distribute the engine with your app.
  Rule: Check each voice model's license and dataset terms.
  License: https://github.com/OHF-Voice/piper1-gpl (checked 2026-10-10; details: https://agentgid.com/assets/piper/)

Paste it into your prompt or AGENTS.md. It is built from the license and API terms below.

License

LicenseGPL-3.0 (engine); per-voice model licenses
Commercial useCommercial use with conditions
CreditCredit depends on the item
Inside your app or gameShip inside your app with conditions
Monetized YouTubeMonetized YouTube with conditions
AI trainingNot stated
Bots and bulk downloadsNot stated
Rules
  • Meet GPL-3.0 obligations if you distribute the engine with your app.
  • Check each voice model's license and dataset terms.

Connect it to an agent

MCP serverNone found
APINo public API: download by hand
PyPIpip install piper-tts
GitHubOHF-Voice/piper1-gpl

Pricing

FreeSelf-hosted; compute only (fast on CPU).
Paid from—
Usage price—
Good to knowThe old rhasspy/piper (MIT) is archived. No zero-shot cloning. The README says the foundation is looking for maintainers.

Sources

Read on Oct 10, 2026: github.com/OHF-Voice/piper1-gpl, github.com/rhasspy/piper, huggingface.co/rhasspy/piper-voices.

Not confirmed: Per-voice dataset terms not checked (the HF card says MIT).

Not legal advice. Check the license page before you ship.

Alternatives to Piper

All voiceover (text-to-speech)

Pick for your agentSourcePriceLicense Monetized YouTubeAgent access
Cartesia Sonic
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Fish Audio
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Speechify API
TTS API (Simba models) with a free plan that lists commercial use.
 Free tier · from $10/mo Commercial OK With conditions API
WellSaid
TTS voices with commercial rights on paid plans; API access is available.
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Chatterbox
MIT-licensed open TTS with zero-shot cloning in 23 languages and a built-in Perth watermark.
 Free Commercial OK No credit Yes PyPI
Kokoro-82M
82M-parameter open-weight TTS model under Apache-2.0 with fixed voice packs.
 Free Commercial OK No credit Yes npm