Piper
A fast neural text-to-speech engine that runs locally, even on modest hardware like a Raspberry Pi.
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About Piper
Piper is a local neural text-to-speech engine. It turns text into spoken audio on your own machine without sending anything to a cloud service, and is light enough to run on modest hardware such as a Raspberry Pi.
The project is maintained under the OHF-Voice organisation and ships as a Python package with a C library, libpiper, and Docker files. That makes it a common choice for voice assistants, home automation and accessibility setups that need offline speech output.
Strengths
- Fast enough for low-power hardware like a Raspberry Pi
- Fully local speech output with no cloud dependency
- Usable from the command line, Python or the libpiper C library
Limitations
- No graphical interface; aimed at command-line and integration use
- Voice quality depends on the chosen voice model
Details
- Pricing
- FreeFree and open source under the GPL.
- License
- GPL-3.0
- Developer
- Open Home Foundation
- Platforms
- Windows, macOS, Linux, Command line
- How it runs
- Downloadable app
- Account
- Not required
- Works offline
- Yes
- Best suited for
- Offline speech output for home automation, voice assistants and low-power devices
- Categories
- Audio tools, Local AI tools
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to Piper
Compare allSoftware that can replace Piper for an important use case, and what changes if you switch.
Kokoro
Small, fast open-weight text-to-speech model you can run locally.
Kokoro is a small, fast open-weight model under Apache-2.0 used as a Python library, while Piper is GPL-3.0 and also offers a C library for integration.
Coqui TTS
Deep learning toolkit for training and running text-to-speech models.
Coqui TTS adds full model training and fine-tuning with pretrained models in many languages, but it has had no repository update since mid-2024 and needs deep learning familiarity.
Chatterbox
Open source text-to-speech model with zero-shot voice cloning.
Chatterbox adds zero-shot voice cloning from a short audio sample under the MIT license, though its speed depends more on local hardware than Piper's Raspberry Pi-friendly engine.
F5-TTS
Open-source text-to-speech model that can clone voices, with a local Gradio interface for running it.
F5-TTS adds voice cloning from a short reference recording and a local Gradio interface, but it is research code that needs a Python setup and ideally a capable GPU.
Bark
Open source generative audio model for expressive multilingual speech.
Bark generates expressive multilingual speech with nonverbal sounds like laughter under the MIT license, but it is slower and more resource-intensive than lightweight engines like Piper.
Tortoise TTS
Open source multi-voice text-to-speech system tuned for quality.
Tortoise TTS offers multiple voices with an emphasis on realistic prosody under Apache-2.0, but it generates speech much more slowly and has had no repository update since late 2024.
GPT-SoVITS
A voice cloning and text-to-speech toolkit that can train a voice from about one minute of audio.
GPT-SoVITS trains a custom voice from about a minute of audio and includes a local web UI, but it is not open source and runs on Windows and Linux only.
OpenVoice
Open source instant voice cloning model with flexible style control.
OpenVoice adds instant voice cloning with control over emotion and accent under the MIT license, though it is mainly used through code and has not been updated since April 2025.
Piper as an alternative
Listings that name Piper as an alternative.
eSpeak NG
Read text aloud with a compact multilingual speech engine.
Piper is a GPL neural text-to-speech engine with more natural voices that runs locally on modest hardware, but it has no Android build or graphical interface.
Similar software
Related functionality, not necessarily a direct replacement.
Applio
A free, open-source AI voice conversion suite for covers, custom voice training and real-time voice changing.
Whisper
An open-source speech recognition model from OpenAI for transcribing and translating audio on your own machine.
whisper.cpp
C/C++ port of OpenAI's Whisper for fast offline speech-to-text on your own hardware.
Handy
Dictate into desktop text fields with local speech recognition.
KoboldCpp
A single executable that runs GGUF language models locally, with a web interface and no installation at all.
Lemonade
A local AI runtime that serves text, image and speech models through a GUI, CLI and API.
