--- title: "index-tts vs Confucius4-TTS" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/index-tts-index-tts-vs-netease-youdao-confucius4-tts" tools: ["index-tts-index-tts", "netease-youdao-confucius4-tts"] --- # index-tts vs Confucius4-TTS *GraphCanon updated Aug 24, 2026* ## Verdict 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; pick Confucius4-TTS if powerful cross-lingual TTS for multilingual audio projects with no need for model fine-tuning. [index-tts](https://github.com/index-tts/index-tts) reports 22k GitHub stars, 2.7k forks, and 369 open issues, last pushed Jul 14, 2026. [Confucius4-TTS](https://github.com/netease-youdao/Confucius4-TTS) has 773 stars, 76 forks, and 11 open issues, last pushed Aug 18, 2026. Figures are from public GitHub metadata via [index-tts's repository](https://github.com/index-tts/index-tts) and [Confucius4-TTS's repository](https://github.com/netease-youdao/Confucius4-TTS). | | [index-tts](/tools/index-tts-index-tts.md) | [Confucius4-TTS](/tools/netease-youdao-confucius4-tts.md) | | --- | --- | --- | | Tagline | A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech | Multilingual and Cross-Lingual Zero-Shot TTS Engine | | Stars | 22,239 | 773 | | Forks | 2,709 | 76 | | Open issues | 369 | 11 | | Language | Python | Python | | Adopt for | 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. | Powerful cross-lingual TTS for multilingual audio projects with no need for model fine-tuning. | | Persona | - | - | | Runtime | - | - | | License | Other | Other | | Categories | Speech & Audio | Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [index-tts](/tools/index-tts-index-tts.md) | [Confucius4-TTS](/tools/netease-youdao-confucius4-tts.md) | | --- | --- | --- | | Maintenance | Active (82%) | Very active (96%) | | Days since push | 14d | 5d | | Open issues (now) | 369 | 11 | | Stars delta | Unknown | +60 (30d) | | Open issues delta | Unknown | +1 (30d) | | Full report | [trust report](/tools/index-tts-index-tts/trust.md) | [trust report](/tools/netease-youdao-confucius4-tts/trust.md) | ## Decision facts: index-tts - **Adopt for:** 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. - **Runtime:** unknown ## Decision facts: Confucius4-TTS - **Adopt for:** Powerful cross-lingual TTS for multilingual audio projects with no need for model fine-tuning. ## Choose when ### Choose index-tts if… - Tags unique to index-tts: bigvgan, indextts, tts, voice-clone. - Use IndexTTS when precise speech duration control is required, such as for professional video dubbing projects where audio-visual synchronization needs to be exact. - More GitHub stars (22k vs 773) - visibility, not fit. ### Choose Confucius4-TTS if… - Tags unique to Confucius4-TTS: audio, deep-learning, fine-tuning, multi-lingual. - Project requires support for multiple languages without the necessity of model fine-tuning. - More recently updated (last pushed Aug 18, 2026). ## 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. ## When NOT to use Confucius4-TTS - When project strictly demands language-specific TTS refinement and customization. - For scenarios needing real-time low-latency TTS performance as Confucius4-TTS focuses on cross-lingual capabilities rather than speed optimizations. ## Common questions ### What is the difference between index-tts and Confucius4-TTS? index-tts: A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech. Confucius4-TTS: Multilingual and Cross-Lingual Zero-Shot TTS Engine. See the comparison table for live GitHub stats and shared categories. ### When should I choose index-tts over Confucius4-TTS? Choose index-tts over Confucius4-TTS when Tags unique to index-tts: bigvgan, indextts, tts, voice-clone; Use IndexTTS when precise speech duration control is required, such as for professional video dubbing projects where audio-visual synchronization needs to be exact; More GitHub stars (22k vs 773) - visibility, not fit. ### When should I choose Confucius4-TTS over index-tts? Choose Confucius4-TTS over index-tts when Tags unique to Confucius4-TTS: audio, deep-learning, fine-tuning, multi-lingual; Project requires support for multiple languages without the necessity of model fine-tuning; More recently updated (last pushed Aug 18, 2026). ### 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. ### When should I avoid Confucius4-TTS? When project strictly demands language-specific TTS refinement and customization. For scenarios needing real-time low-latency TTS performance as Confucius4-TTS focuses on cross-lingual capabilities rather than speed optimizations. ### Is index-tts or Confucius4-TTS more popular on GitHub? index-tts has more GitHub stars (22,239 vs 773). Stars measure visibility, not whether either tool fits your constraints. ### Are index-tts and Confucius4-TTS open source? Yes - both are open-source projects on GitHub (index-tts: Other, Confucius4-TTS: Other). ### Where can I find alternatives to index-tts or Confucius4-TTS? GraphCanon lists graph-backed alternatives at [index-tts alternatives](/tools/index-tts-index-tts/alternatives) and [Confucius4-TTS alternatives](/tools/netease-youdao-confucius4-tts/alternatives) ([index-tts markdown twin](/tools/index-tts-index-tts/alternatives.md), [Confucius4-TTS markdown twin](/tools/netease-youdao-confucius4-tts/alternatives.md)), 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](/compare/index-tts-index-tts-vs-netease-youdao-confucius4-tts.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, index-tts or Confucius4-TTS? index-tts: Active. Confucius4-TTS: Very 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 index-tts and Confucius4-TTS? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [index-tts trust report](/tools/index-tts-index-tts/trust); [Confucius4-TTS trust report](/tools/netease-youdao-confucius4-tts/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=index-tts-index-tts`](/api/graphcanon/graph?tool=index-tts-index-tts) - LLM index: [/llms.txt](/llms.txt) - Full corpus: [/llms-full.txt](/llms-full.txt) _GraphCanon - The knowledge graph for AI development. https://www.graphcanon.com/_