Open Home Foundation

license

GPL-3.0(OSI)

source

public

core features withheld

no

Piper is GPL-3.0, an OSI-approved copyleft license, with no commercial edition; the published repository is the whole engine.

• https://raw.githubusercontent.com/OHF-Voice/piper1-gpl/HEAD/COPYING recorded 2026-09-27

  COPYING body: "GNU GENERAL PUBLIC LICENSE" "Version 3, 29 June 2007".

• https://raw.githubusercontent.com/OHF-Voice/piper1-gpl/HEAD/README.md recorded 2026-09-27

  README carries "A library from the Open Home Foundation" badge; the foundation maintains it ("The Open Home Foundation is looking for maintainers for Piper!") and it builds and trains from the repository.

PyPI downloads of piper-tts, the package the README installs. Downloads count installs, not voices synthesized.

• https://pypistats.org/api/packages/piper-tts/recent recorded 2026-09-27

  "last_month":893727 for piper-tts.

A complete local synthesizer with training support, but for one task and its own voice family.

• https://raw.githubusercontent.com/OHF-Voice/piper1-gpl/HEAD/README.md recorded 2026-09-27

  "A fast and local neural text-to-speech engine that embeds [espeak-ng][] for phonemization."; links "[Training new voices][training]".