--- title: "CosyVoice vs RealtimeTTS" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/funaudiollm-cosyvoice-vs-koljab-realtimetts" tools: ["funaudiollm-cosyvoice", "koljab-realtimetts"] --- # CosyVoice vs RealtimeTTS *GraphCanon updated Jul 12, 2026* ## Verdict Pick CosyVoice when license: CosyVoice is Apache-2.0, RealtimeTTS is MIT; pick RealtimeTTS when license: RealtimeTTS is MIT, CosyVoice is Apache-2.0. [CosyVoice](https://funaudiollm.github.io/cosyvoice3) reports 22k GitHub stars, 2.5k forks, and 767 open issues, last pushed May 25, 2026. [RealtimeTTS](https://github.com/KoljaB/RealtimeTTS) has 4.0k stars, 399 forks, and 125 open issues, last pushed May 31, 2026. Figures are from public GitHub metadata via [CosyVoice's repository](https://github.com/FunAudioLLM/CosyVoice) and [RealtimeTTS's repository](https://github.com/KoljaB/RealtimeTTS). | | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | [RealtimeTTS](/tools/koljab-realtimetts.md) | | --- | --- | --- | | Tagline | Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment. | Converts text to speech in realtime | | Stars | 22,089 | 3,986 | | Forks | 2,545 | 399 | | Open issues | 767 | 125 | | Language | Python | Python | | Adopt for | CosyVoice is a Python-based multi-lingual large voice generation model. It supports extensive capabilities including fine-tuning, TTS (Text-To-Speech), and natural language generation. | - | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | MIT | | Categories | Inference & Serving, Model Training, Speech & Audio | Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | [RealtimeTTS](/tools/koljab-realtimetts.md) | | --- | --- | --- | | Days since push | 46d | 40d | | Open issues (now) | 767 | 125 | | Owner type | Organization | User | | Security scan | No lockfile | No criticals | | Full report | [trust report](/tools/funaudiollm-cosyvoice/trust.md) | [trust report](/tools/koljab-realtimetts/trust.md) | ## Decision facts: CosyVoice - **Adopt for:** CosyVoice is a Python-based multi-lingual large voice generation model. It supports extensive capabilities including fine-tuning, TTS (Text-To-Speech), and natural language generation. ## Choose when ### Choose CosyVoice if… - License: CosyVoice is Apache-2.0, RealtimeTTS is MIT. - Tags unique to CosyVoice: audio-generation, cantonese, chatbot, chatgpt. - Also covers Inference & Serving, Model Training. - When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean. ### Choose RealtimeTTS if… - License: RealtimeTTS is MIT, CosyVoice is Apache-2.0. - Tags unique to RealtimeTTS: python, realtime, speech-synthesis, text-to-speech. - More recently updated (last pushed May 31, 2026). ## When NOT to use CosyVoice - If your project specifically requires fine-tuned performance in languages not supported by CosyVoice such as Arabic or Spanish. - When strict real-time speech synthesis requirements are essential, as CosyVoice may face delays depending on the environment's computational power and model complexity. ## Common questions ### What is the difference between CosyVoice and RealtimeTTS? CosyVoice: Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.. RealtimeTTS: Converts text to speech in realtime. See the comparison table for live GitHub stats and shared categories. ### When should I choose CosyVoice over RealtimeTTS? Choose CosyVoice over RealtimeTTS when License: CosyVoice is Apache-2.0, RealtimeTTS is MIT; Tags unique to CosyVoice: audio-generation, cantonese, chatbot, chatgpt; Also covers Inference & Serving, Model Training; When you need support for multiple languages like Cantonese, Chinese, English, Japanese, and Korean. ### When should I choose RealtimeTTS over CosyVoice? Choose RealtimeTTS over CosyVoice when License: RealtimeTTS is MIT, CosyVoice is Apache-2.0; Tags unique to RealtimeTTS: python, realtime, speech-synthesis, text-to-speech; More recently updated (last pushed May 31, 2026). ### When should I avoid CosyVoice? If your project specifically requires fine-tuned performance in languages not supported by CosyVoice such as Arabic or Spanish. When strict real-time speech synthesis requirements are essential, as CosyVoice may face delays depending on the environment's computational power and model complexity. ### Is CosyVoice or RealtimeTTS more popular on GitHub? CosyVoice has more GitHub stars (22,089 vs 3,986). Stars measure visibility, not whether either tool fits your constraints. ### Are CosyVoice and RealtimeTTS open source? Yes - both are open-source projects on GitHub (CosyVoice: Apache-2.0, RealtimeTTS: MIT). ### Where can I find alternatives to CosyVoice or RealtimeTTS? GraphCanon lists graph-backed alternatives at [CosyVoice alternatives](/tools/funaudiollm-cosyvoice/alternatives) and [RealtimeTTS alternatives](/tools/koljab-realtimetts/alternatives) ([CosyVoice markdown twin](/tools/funaudiollm-cosyvoice/alternatives.md), [RealtimeTTS markdown twin](/tools/koljab-realtimetts/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/funaudiollm-cosyvoice-vs-koljab-realtimetts.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, CosyVoice or RealtimeTTS? CosyVoice: Steady. RealtimeTTS: Steady. 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 CosyVoice and RealtimeTTS? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [CosyVoice trust report](/tools/funaudiollm-cosyvoice/trust); [RealtimeTTS trust report](/tools/koljab-realtimetts/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=funaudiollm-cosyvoice`](/api/graphcanon/graph?tool=funaudiollm-cosyvoice) - 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/_