--- title: "index-tts vs dia2" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/index-tts-index-tts-vs-nari-labs-dia2" tools: ["index-tts-index-tts", "nari-labs-dia2"] --- # index-tts vs dia2 *GraphCanon updated Jul 30, 2026* ## Verdict Pick index-tts when license: index-tts is Other, dia2 is Apache-2.0; pick dia2 when license: dia2 is Apache-2.0, index-tts is Other. [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. [dia2](https://github.com/nari-labs/dia2) has 1.2k stars, 99 forks, and 5 open issues, last pushed Nov 29, 2025. Figures are from public GitHub metadata via [index-tts's repository](https://github.com/index-tts/index-tts) and [dia2's repository](https://github.com/nari-labs/dia2). | | [index-tts](/tools/index-tts-index-tts.md) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Tagline | A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech | TTS model capable of streaming conversational audio in real-time. | | Stars | 22,239 | 1,160 | | Forks | 2,709 | 99 | | Open issues | 369 | 5 | | 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. | - | | Persona | - | - | | Runtime | - | - | | License | Other | Apache-2.0 | | 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) | [dia2](/tools/nari-labs-dia2.md) | | --- | --- | --- | | Maintenance | Active (82%) | Slowing (36%) | | Days since push | 14d | 243d | | Open issues (now) | 369 | 5 | | Owner type | User | Organization | | Full report | [trust report](/tools/index-tts-index-tts/trust.md) | [trust report](/tools/nari-labs-dia2/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 ## Choose when ### Choose index-tts if… - License: index-tts is Other, dia2 is Apache-2.0. - Tags unique to index-tts: bigvgan, cross-lingual, indextts, tts. - Use IndexTTS when precise speech duration control is required, such as for professional video dubbing projects where audio-visual synchronization needs to be exact. ### Choose dia2 if… - License: dia2 is Apache-2.0, index-tts is Other. - Tags unique to dia2: open-weight. - When you need real-time streaming capabilities for text-to-speech applications. ## 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 dia2 - For projects aimed at batch processing or non-realtime TTS applications where instantaneous audio output isn't required. - If you are looking for an open-source model that does not include specific proprietary components like the Kyutai Mimi codec. ## Common questions ### What is the difference between index-tts and dia2? index-tts: A Breakthrough in Emotionally Expressive and Duration-Controlled Auto-Regressive Zero-Shot Text-to-Speech. dia2: TTS model capable of streaming conversational audio in real-time.. See the comparison table for live GitHub stats and shared categories. ### When should I choose index-tts over dia2? Choose index-tts over dia2 when License: index-tts is Other, dia2 is Apache-2.0; Tags unique to index-tts: bigvgan, cross-lingual, indextts, tts; 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 choose dia2 over index-tts? Choose dia2 over index-tts when License: dia2 is Apache-2.0, index-tts is Other; Tags unique to dia2: open-weight; When you need real-time streaming capabilities for text-to-speech applications. ### 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 dia2? For projects aimed at batch processing or non-realtime TTS applications where instantaneous audio output isn't required. If you are looking for an open-source model that does not include specific proprietary components like the Kyutai Mimi codec. ### Is index-tts or dia2 more popular on GitHub? index-tts has more GitHub stars (22,239 vs 1,160). Stars measure visibility, not whether either tool fits your constraints. ### Are index-tts and dia2 open source? Yes - both are open-source projects on GitHub (index-tts: Other, dia2: Apache-2.0). ### Where can I find alternatives to index-tts or dia2? GraphCanon lists graph-backed alternatives at [index-tts alternatives](/tools/index-tts-index-tts/alternatives) and [dia2 alternatives](/tools/nari-labs-dia2/alternatives) ([index-tts markdown twin](/tools/index-tts-index-tts/alternatives.md), [dia2 markdown twin](/tools/nari-labs-dia2/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-nari-labs-dia2.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, index-tts or dia2? index-tts: Active. dia2: Slowing. 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 dia2? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [index-tts trust report](/tools/index-tts-index-tts/trust); [dia2 trust report](/tools/nari-labs-dia2/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/_