head to head · open source
opa vs UTMStack
opa has 12,425 GitHub stars, 1,706 forks, 310 open issues and last shipped yesterday. UTMStack has 592 stars, 83 forks, 141 open issues and last shipped 2 days ago. opa leads on adoption by 1,999% (12,425 vs 592 stars). opa is written in Go under Apache-2.0; UTMStack is written in TypeScript under AGPL-3.0. opa has attracted 14% as many forks as stars, UTMStack 14%. 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 | UTMStack | |
|---|---|---|
| GitHub stars | ★ 12K | ★ 592 |
| License | Apache-2.0 | AGPL-3.0 |
| Written in | Go | TypeScript |
| Last push | 2026-11-04 | 2026-11-03 |
| 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 UTMStack if
- You want the UTMStack feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches TypeScript
- You evaluated both and UTMStack 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 UTMStack
[!IMPORTANT] ⚠️ UPGRADE NOTIFICATION and UTMStack v10 End of Life Notice UTMStack v10 will be sunset on December 5, 2026. As of today, v10 is no longer receiving any new features and will only receive critical fixes until the sunset date. After December 5, 2026, v10 will no longer be supported. 👉 All users must upgrade to v11 as soon as possible using the upgrade package. Full guide here: UTMStack Enterprise ready SIEM and XDR powered by Real Time correlation and Threat Intelligence Introduction Welcome to the UTMStack open source project! UTMStack is a unified threat management platform that merges SIEM…
read the full UTMStack overview →
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Frequently asked questions
Is opa or UTMStack more popular?
opa has 12,425 GitHub stars and UTMStack has 592. opa has the larger community by that measure.
Are opa and UTMStack free?
Both are open source. opa is licensed under Apache-2.0 and UTMStack under AGPL-3.0. Neither carries a licence fee.
What is the difference between opa and UTMStack?
opa is written in Go and UTMStack in TypeScript. 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 UTMStack?
Choose opa if you want the larger community (12,425 stars) or its Apache-2.0 licence terms. Choose UTMStack if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.