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Kokoro-FastAPI vs Piper: catalog facts
Kokoro-FastAPI	Piper
Best for: Self-hosting a fast text-to-speech back end for apps, readers or Home Assistant	Best for: Offline speech output for home automation, voice assistants and low-power devices
Free Free and open source under the Apache 2.0 licence.	Free Free and open source under the GPL.
macOS, Linux, Self-hosted	Windows, macOS, Linux, Command line
OpenAI-compatible speech endpoint Prebuilt multi-architecture Docker images with models included All 4 strengths for Kokoro-FastAPI OpenAI-compatible speech endpoint Prebuilt multi-architecture Docker images with models included Caption timestamps and phoneme endpoints Voice mixing and SSML support	Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency All 3 strengths for Piper 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
AMD GPU support is experimental Apple Silicon has no prebuilt image	No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model
Self-hosted	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0
No account needed	No account needed
Not stated if it works offline	Offline features available
Official website Full listing and sources Sources for Kokoro-FastAPI github.com/remsky/Kokoro-FastAPI Catalog checked September 26, 2026	Official website Full listing and sources Sources for Piper github.com/OHF-Voice/piper1-gpl Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.