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Parolu vs RHVoice: catalog facts
Parolu	RHVoice
Free Free and open source under the GPL 3.0 or later.	Free Free and open source.
Linux	Linux, Android
Simple interface for reading text aloud Includes Esperanto voices out of the box	Runs locally without a network connection Lightweight statistical parametric synthesis
Voices for most languages must be downloaded first Project documentation is mainly in German	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
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 1, 2026	Official website Full listing and sources Checked September 26, 2026

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