Comparison
espeak-ng vs CosyVoice
Verdict
Pick espeak-ng if eSpeak NG: Free text-to-speech engine with over a hundred languages and accents in C under GPL-3.0; pick CosyVoice if 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.
Markdown twin · espeak-ng alternatives · CosyVoice alternatives
GraphCanon updated 3w
vs
Trust & integrity
| Signal | espeak-ng | CosyVoice |
|---|---|---|
| Maintenance | Very active (1d since push) As of 3w · github_public_v1 | Steady (59d since push) As of 4w · github_public_v1 |
| Provenance | Not a fork · Organization account As of 3w · github_public_v1 | Not a fork · Organization account As of 4w · 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
- espeak-ng
- Open source speech synthesizer supporting more than hundred languages and accents
- CosyVoice
- Multi-lingual large voice generation model with full-stack abilities for inference, training and deployment.
Stars
- espeak-ng
- 6.7k
- CosyVoice
- 22k
Forks
- espeak-ng
- 1.3k
- CosyVoice
- 2.6k
Open issues
- espeak-ng
- 594
- CosyVoice
- 756
Language
- espeak-ng
- C
- CosyVoice
- Python
Adopt for
- espeak-ng
- eSpeak NG: Free text-to-speech engine with over a hundred languages and accents in C under GPL-3.0
- CosyVoice
- 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
- espeak-ng
- -
- CosyVoice
- -
Runtime
- espeak-ng
- -
- CosyVoice
- -
License
- espeak-ng
- GPL-3.0
- CosyVoice
- Apache-2.0
Last pushed
- espeak-ng
- Jul 27, 2026
- CosyVoice
- May 25, 2026
Categories
- espeak-ng
- Speech & Audio
- CosyVoice
- Inference & Serving, Model Training, Speech & Audio
Trust and health
Maintenance
- espeak-ng
- Very active (96%)
- CosyVoice
- Steady (60%)
Days since push
- espeak-ng
- 1d
- CosyVoice
- 59d
Open issues (now)
- espeak-ng
- 594
- CosyVoice
- 756
Full report
- espeak-ng
- Trust report
- CosyVoice
- Trust report
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, espeak, espeak-ng, speech-synthesis.
- When multilingual support across over a hundred languages is required.
When NOT to use espeak-ng
- Avoid if proprietary software development prohibits use of GPL-3.0 licensed tools.
- Not ideal if fine-grain control and quality over diverse accents are more important than extensive language coverage.
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.
Explore
Sources
Every stat on this page traces to a dated GitHub sync, license file, enrichment field, or trust scan.
- GitHub stars (espeak-ng/espeak-ng) · observed Jul 29, 2026
- GitHub forks (espeak-ng/espeak-ng) · observed Jul 29, 2026
- Last push (espeak-ng/espeak-ng) · observed Jul 27, 2026
- License file (GPL-3.0) · observed Jul 29, 2026
- Decision facts (enrichment) · observed Jul 17, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
- GitHub stars (FunAudioLLM/CosyVoice) · observed Jul 24, 2026
- GitHub forks (FunAudioLLM/CosyVoice) · observed Jul 24, 2026
- Last push (FunAudioLLM/CosyVoice) · observed May 25, 2026
- License file (Apache-2.0) · observed Jul 24, 2026
- Decision facts (enrichment) · observed Jul 11, 2026
- Trust scan (lockfile / OSV) · observed Jul 11, 2026
GitHub stars on cards: espeak-ng 6.7k · CosyVoice 22k (synced Jul 29, 2026).
Common questions
- What is the difference between espeak-ng and CosyVoice?
- espeak-ng: Open source speech synthesizer supporting 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, espeak, espeak-ng, speech-synthesis; When multilingual support across over a hundred languages is required.
- 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 espeak-ng?
- Avoid if proprietary software development prohibits use of GPL-3.0 licensed tools. Not ideal if fine-grain control and quality over diverse accents are more important than extensive language coverage.
- 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 (22,373 vs 6,688). 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 and CosyVoice alternatives (espeak-ng markdown twin, CosyVoice 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, espeak-ng or CosyVoice?
- espeak-ng: Very 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; CosyVoice trust report.