Comparison
ChatTTS vs index-tts
Verdict
Pick ChatTTS if chatTTS is a Python-based repository for generating speech tailored to everyday conversations in both Chinese and English; pick index-tts if indexTTS is an industrial-level controllable zero-shot text-to-speech system that excels in duration control and emotionally expressive speech generation using autoregressive models.
Markdown twin · ChatTTS alternatives · index-tts alternatives
GraphCanon updated 1w
Trust & integrity
| Signal | ChatTTS | index-tts |
|---|---|---|
| Maintenance | Slowing (127d since push) As of 1w · github_public_v1 | Active (14d since push) As of 3w · github_public_v1 |
| Provenance | Not a fork · Organization account As of 1w · github_public_v1 | Not a fork · Personal account As of 3w · github_public_v1 |
| OSV dependency advisories | No lockfile (source not queried) As of 1mo · osv@v1 | No lockfile (source not queried) As of 1mo · osv@v1 |
| deps.dev advisories | Not queried deps.dev@v1 | Not queried deps.dev@v1 |
| OpenSSF Scorecard | Not queried openssf-scorecard@v1 | Not queried openssf-scorecard@v1 |
Tagline
- ChatTTS
- A generative speech model for daily dialogue
- index-tts
- A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech
Stars
- ChatTTS
- 40k
- index-tts
- 22k
Forks
- ChatTTS
- 4.3k
- index-tts
- 2.7k
Open issues
- ChatTTS
- 60
- index-tts
- 369
Language
- ChatTTS
- Python
- index-tts
- Python
Adopt for
- ChatTTS
- ChatTTS is a Python-based repository for generating speech tailored to everyday conversations in both Chinese and English.
- index-tts
- IndexTTS is an industrial-level controllable zero-shot text-to-speech system that excels in duration control and emotionally expressive speech generation using autoregressive models.
Persona
- ChatTTS
- -
- index-tts
- -
Runtime
- ChatTTS
- -
- index-tts
- -
License
- ChatTTS
- Licensed under AGPL-3.0, which allows for free use, distribution, and modification as long as these rights are maintained in derivative works.
- index-tts
- Other
Last pushed
- ChatTTS
- Apr 10, 2026
- index-tts
- Jul 14, 2026
Categories
- ChatTTS
- AI Agents, Speech & Audio
- index-tts
- Speech & Audio
Trust and health
Maintenance
- ChatTTS
- Slowing (36%)
- index-tts
- Active (82%)
Days since push
- ChatTTS
- 127d
- index-tts
- 14d
Open issues (now)
- ChatTTS
- 60
- index-tts
- 369
Stars delta
- ChatTTS
- +140 (30d)
- index-tts
- Unknown
Open issues delta
- ChatTTS
- -1 (30d)
- index-tts
- Unknown
Owner type
- ChatTTS
- Organization
- index-tts
- User
Full report
- ChatTTS
- Trust report
- index-tts
- Trust report
Choose ChatTTS if…
- License: ChatTTS is AGPL-3.0, index-tts is Other.
- Requirements: Python-based implementation means that familiarity with Python is necessary for effective use..
- Tags unique to ChatTTS: agent, chatgpt, chattts, chinese language.
- Also covers AI Agents.
- Use ChatTTS when you require text-to-speech functionality for daily dialogue applications, especially those involving Chinese or English languages.
When NOT to use ChatTTS
- Avoid using ChatTTS in environments where the speech generation model is expected to handle complex technical jargon or specialized vocabulary, as it's optimized for daily conversation.
- Do not use ChatTTS if your project requires the integration of more than two languages simultaneously due to its current support for only Chinese and English.
Choose index-tts if…
- License: index-tts is Other, ChatTTS is AGPL-3.0.
- Tags unique to index-tts: bigvgan, cross-lingual, indextts, text-to-speech.
- Use IndexTTS when precise speech duration control is required, such as for professional video dubbing projects where audio-visual synchronization needs to be exact.
When NOT to use index-tts
- Avoid using IndexTTS in scenarios where minimal latency is critical, as its autoregressive generation mode may introduce processing delays compared to non-autoregressive methods.
- Do not use if you require support for a wide variety of languages beyond what the system's zero-shot capabilities cover.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (2noise/ChatTTS) · observed Aug 16, 2026
- GitHub forks (2noise/ChatTTS) · observed Aug 16, 2026
- Last push (2noise/ChatTTS) · observed Apr 10, 2026
- License file (AGPL-3.0) · observed Aug 16, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (index-tts/index-tts) · observed Jul 29, 2026
- GitHub forks (index-tts/index-tts) · observed Jul 29, 2026
- Last push (index-tts/index-tts) · observed Jul 14, 2026
- License file (Other) · observed Jul 29, 2026
- Decision facts (enrichment) · observed Jul 16, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: ChatTTS 40k · index-tts 22k (synced Aug 16, 2026).
Common questions
- What is the difference between ChatTTS and index-tts?
- ChatTTS: A generative speech model for daily dialogue. index-tts: A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech. See the comparison table for live GitHub stats and shared categories.
- When should I choose ChatTTS over index-tts?
- Choose ChatTTS over index-tts when License: ChatTTS is AGPL-3.0, index-tts is Other; Requirements: Python-based implementation means that familiarity with Python is necessary for effective use.; Tags unique to ChatTTS: agent, chatgpt, chattts, chinese language; Also covers AI Agents; Use ChatTTS when you require text-to-speech functionality for daily dialogue applications, especially those involving Chinese or English languages.
- When should I choose index-tts over ChatTTS?
- Choose index-tts over ChatTTS when License: index-tts is Other, ChatTTS is AGPL-3.0; Tags unique to index-tts: bigvgan, cross-lingual, indextts, text-to-speech; Use IndexTTS when precise speech duration control is required, such as for professional video dubbing projects where audio-visual synchronization needs to be exact.
- When should I avoid ChatTTS?
- Avoid using ChatTTS in environments where the speech generation model is expected to handle complex technical jargon or specialized vocabulary, as it's optimized for daily conversation. Do not use ChatTTS if your project requires the integration of more than two languages simultaneously due to its current support for only Chinese and English.
- When should I avoid index-tts?
- Avoid using IndexTTS in scenarios where minimal latency is critical, as its autoregressive generation mode may introduce processing delays compared to non-autoregressive methods. Do not use if you require support for a wide variety of languages beyond what the system's zero-shot capabilities cover.
- Is ChatTTS or index-tts more popular on GitHub?
- ChatTTS has more GitHub stars (39,768 vs 22,239). Stars measure visibility, not whether either tool fits your constraints.
- Are ChatTTS and index-tts open source?
- Yes - both are open-source projects on GitHub (ChatTTS: AGPL-3.0, index-tts: Other).
- Where can I find alternatives to ChatTTS or index-tts?
- GraphCanon lists graph-backed alternatives at ChatTTS alternatives and index-tts alternatives (ChatTTS markdown twin, index-tts markdown twin), ranked by typed relationship edges rather than popularity votes.
- Is there a machine-readable version of this comparison?
- Yes. The markdown twin at this comparison mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers.
- Which is better maintained, ChatTTS or index-tts?
- ChatTTS: Slowing. index-tts: Active. Compare maintenance labels, days since push, and release cadence in the trust section below - stars alone do not measure maintenance.
- Where are the full trust reports for ChatTTS and index-tts?
- GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: ChatTTS trust report; index-tts trust report.