Piper
What it is
Piper is a free local neural text-to-speech engine for turning text into spoken audio. It supports 44 languages and exports WAV files. Piper embeds espeak-ng for phonemization and offers a command-line interface, web server, Python API, and C/C++ API. Listed platforms include API, Linux, self-hosted, and web. The project provides installation through `pip install piper-tts` and links instructions for training new voices. Its repository lists GPL-3.0 as the license, with a plan price of free. The README names Home Assistant, NVDA, Open Voice Operating System, JetsonGPT, and LocalAI among projects using Piper, and links Piper JNI as a Java binding. The Open Home Foundation owns and governs Piper among more than 250 open-source projects, standards, drivers, and libraries. The foundation describes principles of privacy, choice, and sustainability for smart homes. Commercial use is marked No.
For and against
For
- Free GPL-3.0 software
- Supports 44 languages
- Provides Python and C/C++ APIs
- Exports WAV audio
- Offers voice-training instructions
Against
- Commercial use is marked No
- WAV is the listed export format
- Requires local installation for listed interfaces
The verdict
Piper combines local speech generation with multiple interfaces and broad language support. Its GPL-3.0 license and no-commercial-use listing should be reviewed before deployment.
Who it suits
Piper suits developers and self-hosting users who need local speech synthesis through command-line, web, or programming interfaces. It also fits projects needing 44-language output and WAV export.
Plans and prices
Piper
GPL-3.0 licensed software
Read 8 Oct 2026 · github.com
On the record
- API access
- Yesgithub.com · read 20 Sep 2026
- Commercial use
- Nogithub.com · read 20 Sep 2026
- Export formats
- WAVgithub.com · read 20 Sep 2026
- Foundation principles
- The Open Home Foundation describes its principles as privacy, choice, and sustainability for smart homes.openhomefoundation.org · read 8 Oct 2026
- Installation
- The README says to install Piper with `pip install piper-tts`.github.com · read 8 Oct 2026
- Integrations and users
- The README lists Home Assistant, NVDA, Open Voice Operating System, JetsonGPT, and LocalAI among projects using Piper.github.com · read 8 Oct 2026
- Interfaces
- The project lists a command-line interface, web server, Python API, and C/C++ API.github.com · read 8 Oct 2026
- Java support
- The README links Piper JNI as a Java binding.github.com · read 8 Oct 2026
- Languages
- 44github.com · read 20 Sep 2026
- License
- The repository lists GPL-3.0 as its license.github.com · read 8 Oct 2026
- Maintainers
- The README says the Open Home Foundation is looking for Piper maintainers and provides [email protected] for inquiries.github.com · read 8 Oct 2026
- Phonemization
- Piper embeds espeak-ng for phonemization.github.com · read 8 Oct 2026
- Purpose
- Piper is described as a fast, local neural text-to-speech engine.github.com · read 8 Oct 2026
- Stewardship
- The Open Home Foundation says it owns and governs Piper among more than 250 open-source projects, standards, drivers, and libraries.openhomefoundation.org · read 8 Oct 2026
- Voice training
- The README links instructions for training new voices.github.com · read 8 Oct 2026
