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RHVoice vs Supertonic TTS: catalog facts
RHVoice	Supertonic TTS
Free Free and open source.	Free Free and open source under the GPL-3.0 licence.
Linux, Android	Android
Runs locally without a network connection Lightweight statistical parametric synthesis	Speech synthesis runs entirely on the device Works offline
Sounds less natural than neural text-to-speech Language and voice coverage is limited compared with commercial engines	Android only Limited to the voices available as Supertonic models
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 2, 2026

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