FeatureSignals Documentation

FeatureSignals is an open-source feature flag management platform built for modern engineering teams. Ship features safely with targeted rollouts, A/B experiments, kill switches, and real-time updates — all without vendor lock-in.

Why FeatureSignals?

• Self-hosted & free — Run on your own infrastructure. No per-seat pricing. Apache-2.0 licensed.
• Real-time updates — Server-Sent Events push flag changes to SDKs instantly.
• A/B experimentation — Built-in variant assignment with consistent hashing and impression tracking.
• Multi-environment — Manage dev, staging, and production from a single dashboard.
• Enterprise-ready — RBAC, audit logging, approval workflows, webhooks, and mutual exclusion groups.
• SDKs for every stack — Go, Node.js, Python, Java, and React with OpenFeature support.
• Edge-ready — Relay proxy for low-latency flag evaluation at the edge.

Quick Links

What do you want to do?	Go to
Get up and running in 5 minutes	Quickstart
Understand the core concepts	Feature Flags
Integrate with your application	SDKs
Explore the REST API	API Reference
Deploy to production	Self-Hosting
Set up A/B experiments	A/B Experimentation

Architecture at a Glance

┌─────────────┐     ┌─────────────────┐     ┌──────────────┐
│  Dashboard   │────▶│   Go API Server  │◀───│  PostgreSQL   │
│  (Next.js)   │     │   (chi router)   │     │  (data store) │
└─────────────┘     └────────┬────────┘     └──────────────┘
                             │
              ┌──────────────┼──────────────┐
              │              │              │
         ┌────▼───┐   ┌─────▼────┐   ┌────▼────┐
         │  SDKs   │   │  Relay    │   │  SSE     │
         │Go/Node/ │   │  Proxy    │   │ Stream   │
         │Py/Java/ │   │  (edge)   │   │(real-time)│
         │React    │   └──────────┘   └─────────┘
         └─────────┘

License

FeatureSignals is licensed under Apache-2.0.