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Piper vs Kokoro-FastAPI: catalog facts
Piper	Kokoro-FastAPI
Free Free and open source under the GPL.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux, Command line	macOS, Linux, Self-hosted
Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency	OpenAI-compatible speech endpoint Prebuilt multi-architecture Docker images with models included
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	AMD GPU support is experimental Apple Silicon has no prebuilt image
Downloadable app	Self-hosted
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 26, 2026

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