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SmartVoice vs RHVoice: catalog facts
SmartVoice	RHVoice
Free Free and open source under the MIT license.	Free Free and open source.
Android	Linux, Android
Automatic language recognition and voice switching Adjustable volume, speech rate, and pitch for each voice	Runs locally without a network connection Lightweight statistical parametric synthesis
Requires Android 7.0 or later Automatic language recognition supports only a subset of languages	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: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it 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.