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Marmalade TTS vs Supertonic TTS: catalog facts
Marmalade TTS	Supertonic TTS
Free Free and open source; the published app is distributed under GPL-3.0-or-later.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Works as Android's system text-to-speech engine Includes an English voice that works offline	Speech synthesis runs entirely on the device Works offline
Cloud voices require a provider API key	Android only Limited to the voices available as Supertonic models
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-only
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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