head to head · open source
Flagsmith vs Opengrep
Flagsmith has 6,638 GitHub stars, 595 forks, 711 open issues and last shipped 2 days ago. Opengrep has 3,273 stars, 287 forks, 92 open issues and last shipped 2 days ago. Flagsmith leads on adoption by 103% (6,638 vs 3,273 stars). Flagsmith is written in Python under BSD-3-Clause; Opengrep is written in OCaml under LGPL-2.1. Flagsmith has attracted 9% as many forks as stars, Opengrep 9%. Flagsmith 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
| Flagsmith | Opengrep | |
|---|---|---|
| GitHub stars | ★ 6.6K | ★ 3.3K |
| License | BSD-3-Clause | LGPL-2.1 |
| Written in | Python | OCaml |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 595 | ⑂ 287 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Flagsmith if
- You weight community size — 6.6K stars and counting
- You want the BSD-3-Clause license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick Opengrep if
- You want the Opengrep feature set and don't need the biggest community
- You prefer the LGPL-2.1 license terms
- Your stack matches OCaml
- You evaluated both and Opengrep fits your workflow better
About Flagsmith
Try our interactive demo Flagsmith is an Open Source Feature Flagging Tool to Ship Faster & Control Releases Change the way your team releases software. Roll out, segment, and optimise—with granular control. Stay secure with on premise and private cloud hosting. Feature flags: Release features behind the safety of a feature flag Make changes remotely: Easily toggle individual features on and off, and make changes without deploying new code A/B testing: Use segments to run A/B and multivariate tests on new features Segments: Release features to beta testers, collect feedback, and iterate Organisation management…
read the full Flagsmith overview →
About Opengrep
Welcome to Opengrep, a fork of Semgrep, under the LGPL 2.1 license Opengrep is the most advanced open source SAST engine. Let's make secure software development a shared standard. Opengrep provides every developer and organisation with open and advanced static code analysis. Opengrep is backed by a consortium of AppSec organisations, including: Aikido, Amplify, Endor Labs, Kodem, and Orca Security. To learn more, read the manifesto at opengrep.dev. Why Opengrep? Opengrep was created when Semgrep moved critical features behind a commercial licence. We believe advanced static analysis should remain open and…
read the full Opengrep overview →
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Frequently asked questions
Is Flagsmith or Opengrep more popular?
Flagsmith has 6,638 GitHub stars and Opengrep has 3,273. Flagsmith has the larger community by that measure.
Are Flagsmith and Opengrep free?
Both are open source. Flagsmith is licensed under BSD-3-Clause and Opengrep under LGPL-2.1. Neither carries a licence fee.
What is the difference between Flagsmith and Opengrep?
Flagsmith is written in Python and Opengrep in OCaml. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Flagsmith or Opengrep?
Choose Flagsmith if you want the larger community (6,638 stars) or its BSD-3-Clause licence terms. Choose Opengrep if its feature set, stack or LGPL-2.1 licence fits better. Both are self-hostable.