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Marmalade TTS vs RHVoice: catalog facts
Marmalade TTS	RHVoice
Free Free and open source; the published app is distributed under GPL-3.0-or-later.	Free Free and open source.
Android	Linux, Android
Works as Android's system text-to-speech engine Includes an English voice that works offline	Runs locally without a network connection Lightweight statistical parametric synthesis
Cloud voices require a provider API key	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-or-later	License not stated
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 September 26, 2026

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