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Piper vs edge-tts: catalog facts
Piper	edge-tts
Free Free and open source under the GPL.	Free Free and open source; it uses Microsoft's online service at no cost.
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	No API key or Microsoft account needed Writes subtitles alongside the audio
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	Depends on Microsoft's online service, so it needs internet and could break if the service changes Playback command needs mpv on macOS and Linux
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: LGPL-3.0
No account needed	No account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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