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Piper vs Kokoro: catalog facts
Piper	Kokoro
Free Free and open source under the GPL.	Free Free and open source under the Apache-2.0 license.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency	Very small model size makes it fast and cheap to run locally Apache-licensed weights allow unrestricted deployment
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	No repository activity reflected since mid-2025 No built-in graphical interface; used as a Python library
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	Not stated if an account is 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 22, 2026

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