--- title: "merlin vs Amphion" type: "comparison" canonical_url: "https://www.graphcanon.com/compare/cstr-edinburgh-merlin-vs-open-mmlab-amphion" tools: ["cstr-edinburgh-merlin", "open-mmlab-amphion"] --- # merlin vs Amphion *GraphCanon updated Jul 12, 2026* ## Verdict Pick merlin when license: merlin is Apache-2.0, Amphion is MIT; pick Amphion when license: Amphion is MIT, merlin is Apache-2.0. [merlin](http://www.cstr.ed.ac.uk/projects/merlin/) reports 1.3k GitHub stars, 431 forks, and 207 open issues, last pushed Mar 3, 2020. [Amphion](https://openhlt.github.io/amphion/) has 9.9k stars, 822 forks, and 175 open issues, last pushed Mar 25, 2026. Figures are from public GitHub metadata via [merlin's repository](https://github.com/CSTR-Edinburgh/merlin) and [Amphion's repository](https://github.com/open-mmlab/Amphion). | | [merlin](/tools/cstr-edinburgh-merlin.md) | [Amphion](/tools/open-mmlab-amphion.md) | | --- | --- | --- | | Tagline | Neural Network based Speech Synthesis System | Amphion (/æmˈfaɪən/) is a toolkit for Audio, Music, and Speech Generation. Its purpose is to support reproducible research and help junior researchers and engineers get started in the field of audio, | | Stars | 1,319 | 9,927 | | Forks | 431 | 822 | | Open issues | 207 | 175 | | Language | Python | Python | | Adopt for | Merlin is an open-source Python toolkit for building Deep Neural Network models for statistical parametric speech synthesis that requires pairing with a text processor and vocoder. | - | | Persona | - | - | | Runtime | - | - | | License | Apache-2.0 | MIT | | Categories | Speech & Audio | Computer Vision, Inference & Serving, Speech & Audio | ## Trust and health _Sourced signals - not a safety guarantee. No winner column._ | | [merlin](/tools/cstr-edinburgh-merlin.md) | [Amphion](/tools/open-mmlab-amphion.md) | | --- | --- | --- | | Maintenance | Dormant (18%) | Slowing (36%) | | Days since push | 2321d | 107d | | Open issues (now) | 207 | 175 | | Security scan | 594 low (594 low) | No lockfile | | Full report | [trust report](/tools/cstr-edinburgh-merlin/trust.md) | [trust report](/tools/open-mmlab-amphion/trust.md) | ## Shared compatibility - **Python**: [merlin](/tools/cstr-edinburgh-merlin.md) - Python runtime; [Amphion](/tools/open-mmlab-amphion.md) - Python runtime ## Decision facts: merlin - **Adopt for:** Merlin is an open-source Python toolkit for building Deep Neural Network models for statistical parametric speech synthesis that requires pairing with a text processor and vocoder. ## Choose when ### Choose merlin if… - License: merlin is Apache-2.0, Amphion is MIT. - Tags unique to merlin: deep-learning, keras, speech-synthesis, tensorflow. - Merlin is an open-source Python toolkit for building Deep Neural Network models for statistical parametric speech synthesis that requires pairing with a text processor and vocoder. ### Choose Amphion if… - License: Amphion is MIT, merlin is Apache-2.0. - Tags unique to Amphion: audio-generation, audio-synthesis, audioldm, audit. - Also covers Computer Vision, Inference & Serving. - Amphion ships Docker support for self-hosted deployment. ## When NOT to use merlin - Last GitHub push was 2322 days ago (dormant maintenance, Mar 3, 2020). Validate activity before betting a new project on merlin. ## When NOT to use Amphion - Last GitHub push was 108 days ago (slowing maintenance, Mar 25, 2026). Validate activity before betting a new project on Amphion. - Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. ## Common questions ### What is the difference between merlin and Amphion? merlin: Neural Network based Speech Synthesis System. Amphion: Amphion (/æmˈfaɪən/) is a toolkit for Audio, Music, and Speech Generation. Its purpose is to support reproducible research and help junior researchers and engineers get started in the field of audio, . See the comparison table for live GitHub stats and shared categories. ### When should I choose merlin over Amphion? Choose merlin over Amphion when License: merlin is Apache-2.0, Amphion is MIT; Tags unique to merlin: deep-learning, keras, speech-synthesis, tensorflow; Merlin is an open-source Python toolkit for building Deep Neural Network models for statistical parametric speech synthesis that requires pairing with a text processor and vocoder. ### When should I choose Amphion over merlin? Choose Amphion over merlin when License: Amphion is MIT, merlin is Apache-2.0; Tags unique to Amphion: audio-generation, audio-synthesis, audioldm, audit; Also covers Computer Vision, Inference & Serving; Amphion ships Docker support for self-hosted deployment. ### When should I avoid merlin? Last GitHub push was 2322 days ago (dormant maintenance, Mar 3, 2020). Validate activity before betting a new project on merlin. ### When should I avoid Amphion? Last GitHub push was 108 days ago (slowing maintenance, Mar 25, 2026). Validate activity before betting a new project on Amphion. Inference & Serving: Self-hosting rarely beats a hosted API on cost until you have steady, high-volume traffic. ### Is merlin or Amphion more popular on GitHub? Amphion has more GitHub stars (9,927 vs 1,319). Stars measure visibility, not whether either tool fits your constraints. ### Are merlin and Amphion open source? Yes - both are open-source projects on GitHub (merlin: Apache-2.0, Amphion: MIT). ### Where can I find alternatives to merlin or Amphion? GraphCanon lists graph-backed alternatives at [merlin alternatives](/tools/cstr-edinburgh-merlin/alternatives) and [Amphion alternatives](/tools/open-mmlab-amphion/alternatives) ([merlin markdown twin](/tools/cstr-edinburgh-merlin/alternatives.md), [Amphion markdown twin](/tools/open-mmlab-amphion/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/cstr-edinburgh-merlin-vs-open-mmlab-amphion.md) mirrors this page for agents and LLM crawlers, with the same stats table and FAQ answers. ### Which is better maintained, merlin or Amphion? merlin: Dormant. Amphion: 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 merlin and Amphion? GraphCanon publishes per-repo trust reports with dated maintenance, provenance, and scan summaries: [merlin trust report](/tools/cstr-edinburgh-merlin/trust); [Amphion trust report](/tools/open-mmlab-amphion/trust). --- **Machine-readable endpoints** - JSON: [`/api/graphcanon/graph?tool=cstr-edinburgh-merlin`](/api/graphcanon/graph?tool=cstr-edinburgh-merlin) - 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/_