--- title: "espeak-ng vs CosyVoice" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/espeak-ng-espeak-ng-vs-funaudiollm-cosyvoice" tools: ["espeak-ng-espeak-ng", "funaudiollm-cosyvoice"] --- # espeak-ng vs CosyVoice *GraphCanon updated Jul 12, 2026* ## Verdict Pick espeak-ng when espeak-ng is primarily C; CosyVoice is Python; pick CosyVoice when cosyVoice is primarily Python; espeak-ng is C. [espeak-ng](https://github.com/espeak-ng/espeak-ng) reports 6.6k GitHub stars, 1.3k forks, and 617 open issues, last pushed Jun 29, 2026. [CosyVoice](https://funaudiollm.github.io/cosyvoice3) has 22k stars, 2.5k forks, and 767 open issues, last pushed May 25, 2026. Figures are from public GitHub metadata via [espeak-ng's repository](https://github.com/espeak-ng/espeak-ng) and [CosyVoice's repository](https://github.com/FunAudioLLM/CosyVoice). | | [espeak-ng](/tools/espeak-ng-espeak-ng.md) | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | | --- | --- | --- | | Tagline | eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents. | Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment. | | Stars | 6,634 | 22,089 | | Forks | 1,251 | 2,545 | | Open issues | 617 | 767 | | Language | C | 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 | GPL-3.0 | Apache-2.0 | | Categories | Speech & Audio | Inference & Serving, Model Training, Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [espeak-ng](/tools/espeak-ng-espeak-ng.md) | [CosyVoice](/tools/funaudiollm-cosyvoice.md) | | --- | --- | --- | | Maintenance | Active (82%) | Steady (60%) | | Days since push | 12d | 46d | | Open issues (now) | 617 | 767 | | Full report | [trust report](/tools/espeak-ng-espeak-ng/trust.md) | [trust report](/tools/funaudiollm-cosyvoice/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 espeak-ng if… - espeak-ng is primarily C; CosyVoice is Python. - License: espeak-ng is GPL-3.0, CosyVoice is Apache-2.0. - Tags unique to espeak-ng: android, c++, espeak, espeak-ng. ### Choose CosyVoice if… - CosyVoice is primarily Python; espeak-ng is C. - License: CosyVoice is Apache-2.0, espeak-ng is GPL-3.0. - 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 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 espeak-ng and CosyVoice? espeak-ng: eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents.. CosyVoice: Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.. See the comparison table for live GitHub stats and shared categories. ### When should I choose espeak-ng over CosyVoice? Choose espeak-ng over CosyVoice when espeak-ng is primarily C; CosyVoice is Python; License: espeak-ng is GPL-3.0, CosyVoice is Apache-2.0; Tags unique to espeak-ng: android, c++, espeak, espeak-ng. ### When should I choose CosyVoice over espeak-ng? Choose CosyVoice over espeak-ng when CosyVoice is primarily Python; espeak-ng is C; License: CosyVoice is Apache-2.0, espeak-ng is GPL-3.0; 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 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 espeak-ng or CosyVoice more popular on GitHub? CosyVoice has more GitHub stars (22,089 vs 6,634). Stars measure visibility, not whether either tool fits your constraints. ### Are espeak-ng and CosyVoice open source? Yes - both are open-source projects on GitHub (espeak-ng: GPL-3.0, CosyVoice: Apache-2.0). ### Where can I find alternatives to espeak-ng or CosyVoice? GraphCanon lists graph-backed alternatives at [espeak-ng alternatives](/tools/espeak-ng-espeak-ng/alternatives) and [CosyVoice alternatives](/tools/funaudiollm-cosyvoice/alternatives) ([espeak-ng markdown twin](/tools/espeak-ng-espeak-ng/alternatives.md), [CosyVoice markdown twin](/tools/funaudiollm-cosyvoice/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/espeak-ng-espeak-ng-vs-funaudiollm-cosyvoice.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, espeak-ng or CosyVoice? espeak-ng: Active. CosyVoice: 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 espeak-ng and CosyVoice? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [espeak-ng trust report](/tools/espeak-ng-espeak-ng/trust); [CosyVoice trust report](/tools/funaudiollm-cosyvoice/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=espeak-ng-espeak-ng`](/api/graphcanon/graph?tool=espeak-ng-espeak-ng) - 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/_