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Supertonic TTS vs Marmalade TTS: catalog facts
Supertonic TTS	Marmalade TTS
Free Free and open source under the GPL-3.0 licence.	Free Free and open source; the published app is distributed under GPL-3.0-or-later.
Android	Android
Speech synthesis runs entirely on the device Works offline	Works as Android's system text-to-speech engine Includes an English voice that works offline
Android only Limited to the voices available as Supertonic models	Cloud voices require a provider API key
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-or-later
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 October 8, 2026

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