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Piper vs Open JTalk: catalog facts
Piper	Open JTalk
Free Free and open source under the GPL.	Free Free under the Modified BSD license; the listed voice is under CC-BY-3.0.
Windows, macOS, Linux, Command line	Linux, Command line
Fast enough for low-power hardware like a Raspberry Pi Fully local speech output with no cloud dependency	Converts Japanese text to speech Provides compiled dictionaries in several encodings
No graphical interface; aimed at command-line and integration use Voice quality depends on the chosen voice model	The project site documents Linux support The listed HTS voice is from 2012
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-3-Clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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