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Sherpa-ONNXPiper
Free

Free and open source.

 Free

Free and open source under the GPL.

Windows, macOS, Linux, Android, iOS, Self-hosted, Command line Windows, macOS, Linux, Command line
  • Works fully offline
  • Runs on phones, single-board computers and NPUs as well as servers
  • Fast enough for low-power hardware like a Raspberry Pi
  • Fully local speech output with no cloud dependency
  • Mainly a developer toolkit with technical setup
  • Models must be downloaded and chosen separately
  • No graphical interface; aimed at command-line and integration use
  • Voice quality depends on the chosen voice model
Downloadable app, Self-hosted Downloadable app
Open source Open source
License: Apache-2.0 License: GPL-3.0
No account needed No account needed
Works offline Works offline

Checked October 1, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.