head to head · open source
opa vs attestix
opa has 12,282 GitHub stars, 1,686 forks, 310 open issues and last shipped today. attestix has 722 stars, 83 forks, 21 open issues and last shipped 2 days ago. opa leads on adoption by 1,601% (12,282 vs 722 stars). opa is written in Go under Apache-2.0; attestix is written in Python under Apache-2.0. opa has attracted 14% as many forks as stars, attestix 11%. opa was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (compliance), so they are genuine substitutes rather than adjacent tools.
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 | attestix | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 722 |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Go | Python |
| Last push | 2026-09-29 | 2026-09-27 |
| Forks | ⑂ 1.7K | ⑂ 83 |
| 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 attestix if
- You want the attestix feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Python
- You evaluated both and attestix fits your workflow better
About opa
Open Policy Agent (OPA) is an open source, general purpose policy engine that enables unified, context aware policy enforcement across the entire stack. It lives in the cloud native ecosystem as a graduated project in the Cloud Native Computing Foundation landscape, and it is written in Go under the Apache 2.0 license. Policy is expressed declaratively in the Rego language, and the project ships alongside a CLI, an HTTP REST API, a Go SDK, and editor tooling rather than as a single binary alone. The repository has been active for roughly eleven years, with 12,234 stars, 1,679 forks, and a last push dated 15 Septe…
About attestix
Attestix is an open source attestation infrastructure for AI agents that provides DID based agent identity, W3C Verifiable Credentials, an EU AI Act compliance layer, delegation chains, and reputation scoring, and it is aimed at teams building or operating autonomous agents that need to prove identity and compliance to another agent, a regulator, or a downstream system.
read the full attestix overview →
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Frequently asked questions
Is opa or attestix more popular?
opa has 12,282 GitHub stars and attestix has 722. opa has the larger community by that measure.
Are opa and attestix free?
Both are open source. opa is licensed under Apache-2.0 and attestix under Apache-2.0. Neither carries a licence fee.
What is the difference between opa and attestix?
opa is written in Go and attestix 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 attestix?
Choose opa if you want the larger community (12,282 stars) or its Apache-2.0 licence terms. Choose attestix if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.