Compare software

Piper vs Coqui TTS: catalog facts
Piper	Coqui TTS
Free Free and open source under the GPL.	Free Free and open source under the Mozilla Public License 2.0.
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	Pretrained models across a very large number of languages Supports both inference and full model training or fine-tuning
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	No repository update reflected since mid-2024, coinciding with the original company shutting down Advanced use requires deep learning familiarity
Downloadable app	Downloadable app, Self-hosted
Open source	Open source
License: GPL-3.0	License: MPL-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.