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RHVoice vs Open JTalk: catalog facts
RHVoice	Open JTalk
Free Free and open source.	Free Free under the Modified BSD license; the listed voice is under CC-BY-3.0.
Linux, Android	Linux, Command line
Runs locally without a network connection Lightweight statistical parametric synthesis	Converts Japanese text to speech Provides compiled dictionaries in several encodings
Sounds less natural than neural text-to-speech Language and voice coverage is limited compared with commercial engines	The project site documents Linux support The listed HTS voice is from 2012
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD-3-Clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked October 8, 2026

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