Compare / Flagsmith
Flaggr vs Flagsmith
The closest open-source peer — self-hostable with a remote-config focus
Flagsmith is open-source and self-hostable — the nearest peer to Flaggr philosophically. It centers on remote config and straightforward flag management with a solid hosted offering.
Side by side
| Area | Flaggr | Flagsmith | |
|---|---|---|---|
| Licensing | MIT — fully open | BSD-3 open core | |
| Protocols | REST, Connect-RPC, gRPC-Web, OFREP, SSE | REST + SDK | flaggr |
| Evaluation engine | Go data plane, WASM edge, sub-ms evals | Python/Django core | flaggr |
| Observability | OTel + Prometheus + Grafana + toggle-impact analysis | Basic analytics, third-party hooks | flaggr |
| Progressive delivery | Canary pipelines with health gating, auto-rollback circuit breakers | Scheduled + percentage rollouts | flaggr |
| AI agent support | Native MCP server | No public MCP surface | flaggr |
| Remote config UX | Targeting rules + variants | First-class remote config for non-engineers | them |
Where Flaggr leads
- Open-source (MIT) and self-hostable — Next.js control plane + Go data plane, Helm chart included
- Multi-protocol by design: REST, Connect-RPC, gRPC-Web, OFREP, and SSE streaming
- Built-in observability — OpenTelemetry traces, Prometheus metrics, Grafana dashboards, toggle-impact drift analysis, and circuit-breaker auto-rollback
- MCP server — AI agents can list, toggle, and evaluate flags natively
- Closed-loop delivery — canary pipelines with health gating, multi-armed bandits, cohort targeting
- Live public demo — a 4,096-flag pixel grid on flaggr.dev exercises the real API in front of you
Where Flagsmith fits better
Honest cases — we'd rather you pick the right tool.
- Remote config for non-technical teams is the primary use case
- You want a longer-tenured open-source community around flag management
- Flagsmith strengths: open-source with a mature self-hosted offering
Common questions
How does Flaggr compare to Flagsmith on performance?
Flaggr's evaluation path runs on a Go data plane with snapshot caching — warm batch evaluations of thousands of flags land around 100ms. Flagsmith's Python core is adequate for most workloads but heavier under high-QPS evaluation.
Both are open-source — what's the real difference?
Depth vs. breadth. Flagsmith optimizes for remote-config simplicity; Flaggr optimizes for engineering depth — multi-protocol eval, OTel observability, canary automation, and an MCP server for AI agents.
Can I self-host Flaggr like Flagsmith?
Yes — Flaggr ships a Helm chart for Kubernetes and runs on Postgres + Redis. The control plane deploys anywhere Next.js runs.
Try Flaggr in front of you
The landing-page pixel grid drives 4,096 real flags through the public API — or self-host the whole stack in minutes.
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