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Coqui TTS vs Piper: catalog facts
Coqui TTS	Piper
Free Free and open source under the Mozilla Public License 2.0.	Free Free and open source under the GPL.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Pretrained models across a very large number of languages Supports both inference and full model training or fine-tuning	Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency
No repository update reflected since mid-2024, coinciding with the original company shutting down Advanced use requires deep learning familiarity	No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model
Downloadable app, Self-hosted	Downloadable app
Open source	Open source
License: MPL-2.0	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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