Piper
Piper: A capable free local TTS engine for developers, automation, and accessibility projects. Ranked #90 of 222 in Text-to-Speech Software by our editors (3.0/10); pricing: Free plan; best for free local automation and accessibility projects.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forFree local automation and accessibility projects
- Free planYes
- Paid fromFree
- Commercial useNo
- Facts checked20 Sep 2026
Where it wins
- Free, open-source engine with local offline speech synthesis
- Command-line, HTTP, Python, and C/C++ interfaces
- Streaming audio, multi-speaker voices, CUDA, and voice training
Where it doesn't
- Commercial use is not supported
- Voice models can have separate licensing terms
- Archived original repository redirects development elsewhere
Our verdict on Piper
Piper is an open-source, local text-to-speech engine for developers and projects that need offline speech synthesis. It supports command-line generation, HTTP, Python, and C/C++ interfaces, with WAV export across web, Linux, and API workflows. Its intended audience includes automation builders, accessibility projects, and users who want speech generation without depending on a hosted service. Voice models are downloadable, available in many languages, and may support multiple speakers.
Its strongest advantage is the breadth of ways to integrate speech into a local system. Piper can stream raw audio, use CUDA acceleration through ONNX Runtime, and connect with Home Assistant and NVDA. The API coverage also gives teams flexibility: lightweight scripts can use the command line or Python, while larger applications can use HTTP or C/C++. Training new voice models adds a path for customization, although that requires more technical effort than simply downloading an existing model.
Piper is free and open source, but its licensing profile requires attention. Commercial use is not supported, and individual voice models may have their own licensing terms. The original rhasspy/piper repository was archived on October 6, 2025, with development directed to OHF-Voice/piper1-gpl. Choose Piper for free, local automation, offline accessibility features, and developer-controlled deployment. Choose an alternative when commercial rights, a managed hosted service, or a simpler no-code workflow is essential.
Your product? Our editors can test Piper in depth and publish a review, labelled as paid · from $149/mo →
Piper pricing
Piper fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Commercial use | No |
| Voice cloning | Not verified |
| API access | Yes |
| Languages | 44 languages |
| Maximum input | Not verified |
| Export formats | WAV |
| Platforms | web, linux, api |
| Deployment | Self-hosted |
| Platforms | Web, Linux |
| Support | Community, Docs |
| Built for | Solo, Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | github.com |
| Facts checked | 20 Sep 2026 |
Alternatives to Piper
- ElevenLabsAffordable voice cloning with multilingual generation, dubbing, streaming, and API access.9.4
- Google Cloud Text-to-SpeechA broad, API-only TTS service for developers building voice-enabled products.9.3
- Azure AI SpeechA broad, production-ready TTS platform for teams building voice applications.9.2
Also Ranked In
Piper is ranked in 5 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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