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IndexTTS vs ChatTTS: catalog facts
IndexTTS	ChatTTS
Free Free to download and run from the GitHub repository.	Free Free; the code is AGPL-3.0 and the released model is for academic use.
Command line	Command line
Zero-shot voice cloning from a reference sample Control over emotion and duration	Natural conversational prosody with laughter and pauses Multiple speakers in one model
Requires a Python setup and suitable hardware License terms need checking before commercial use	Only English and Chinese supported Released model is restricted to academic use
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: AGPL-3.0
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 2, 2026

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