Best Self-Hosted Feature Flag & Experimentation Tools in 2026

Tools for managing feature flags, gradual rollouts, kill switches, and A/B experiments without redeploying code.

The top-rated pick is Unleash with 14,014 GitHub stars.

2 self-hosted feature flag & experimentation tools — ranked by GitHub stars.Browse all

Unleash

Open-source feature management platform for feature flags, gradual rollouts, kill switches, and A/B testing on your own infrastructure.

Alternative to:

LaunchDarkly

flagd

OpenFeature-compliant feature flag daemon that evaluates flags from files, HTTP, gRPC, Kubernetes, or cloud storage over HTTP and gRPC.

Alternative to:

LaunchDarkly

Why self-host?

Self-hosting puts you in control. You own your data, avoid vendor lock-in, and eliminate recurring subscription costs. For teams handling sensitive data or operating under strict compliance requirements, running your own infrastructure is often the only viable option.