head to head · open source
opa vs Amphion
opa has 12,425 GitHub stars, 1,706 forks, 310 open issues and last shipped yesterday. Amphion has 10,330 stars, 856 forks, 174 open issues and last shipped 8 months ago. opa leads on adoption by 20% (12,425 vs 10,330 stars). opa is written in Go under Apache-2.0; Amphion is written in Python under MIT. opa has attracted 14% as many forks as stars, Amphion 8%. opa was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| opa | Amphion | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 10K |
| License | Apache-2.0 | MIT |
| Written in | Go | Python |
| Last push | 2026-11-04 | 2026-03-25 |
| Forks | ⑂ 1.7K | ⑂ 856 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick opa if
- You weight community size — 12K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick Amphion if
- You want the Amphion feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and Amphion fits your workflow better
About opa
Open Policy Agent Open Policy Agent (OPA) is an open source, general purpose policy engine that enables unified, context aware policy enforcement across the entire stack. OPA is proud to be a graduated project in the Cloud Native Computing Foundation (CNCF) landscape. For details read the CNCF announcement. Get started with OPA Write your first Rego policy with the Rego Playground or use it to share your work with others for feedback and support. Have a look at the Access Control examples if you're not sure where to start. Install the VS Code extension to get started locally with live diagnostics, debugging and…
About Amphion
Amphion: An Open Source Audio, Music, and Speech Generation Toolkit .svg" 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, music, and speech generation research and development. Amphion offers a unique feature: visualizations of classic models or architectures. We believe that these visualizations are beneficial for junior researchers and engineers who wish to gain a better understanding of the model. The North Star objective of Amphion is to offer a platform for…
read the full Amphion overview →
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Frequently asked questions
Is opa or Amphion more popular?
opa has 12,425 GitHub stars and Amphion has 10,330. opa has the larger community by that measure.
Are opa and Amphion free?
Both are open source. opa is licensed under Apache-2.0 and Amphion under MIT. Neither carries a licence fee.
What is the difference between opa and Amphion?
opa is written in Go and Amphion in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, opa or Amphion?
Choose opa if you want the larger community (12,425 stars) or its Apache-2.0 licence terms. Choose Amphion if its feature set, stack or MIT licence fits better. Both are self-hostable.