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Open JTalk vs Piper: catalog facts
Open JTalk	Piper
Free Free under the Modified BSD license; the listed voice is under CC-BY-3.0.	Free Free and open source under the GPL.
Linux, Command line	Windows, macOS, Linux, Command line
Converts Japanese text to speech Provides compiled dictionaries in several encodings	Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency
The project site documents Linux support The listed HTS voice is from 2012	No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-3.0
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 23, 2026

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