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

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