What is FeatureSignals?
FeatureSignals is an open-core feature flag platformbuilt for teams that ship fast. It gives you sub-millisecond flag evaluation, AI-powered stale flag detection, and OpenFeature-native SDKs — so you can deploy when you want, release when you're ready, and keep your codebase clean.
What Are Feature Flags?
A feature flag (also called a feature toggle) is a conditional switch in your code that lets you turn functionality on or off without deploying new code. Instead of coupling deployment to release, you decouple them:
- Deploy — Push code to production behind a flag (inactive).
- Test — Enable the flag for internal users, staging, or a subset of production traffic.
- Release — Gradually roll out to all users. If something breaks, flip the flag off — no rollback, no hotfix, no downtime.
- Clean up — Remove the flag and the old code path once the feature is stable and fully released.
What Makes FeatureSignals Different
Sub-Millisecond Evaluation
The evaluation engine is built in Go and optimized for the hot path. Flags resolve in <1ms p99, so your application never feels the overhead.
AI Janitor
Our AI Janitor automatically detects stale, unreachable, and zombie flags. It surfaces cleanup recommendations before they become technical debt.
OpenFeature-Native SDKs
Server SDKs for Go, Node.js, Python, Java, Ruby, .NET, and more. Built on the OpenFeature standard so you can switch providers without rewriting code.
Open-Core
The core platform is free and open source under Apache 2.0. Enterprise features — RBAC, audit logs, SSO, and SLA-backed uptime — are available with a license.
Who It's For
FeatureSignals is built for engineering teams that value speed, reliability, and clean code:
Startups & Scale-ups
Move fast without breaking things. Toggle features, run experiments, and clean up flags before they pile up.
Mid-Market Teams
RBAC, audit logs, and SLA-backed reliability. The control plane grows with your team and your compliance needs.
Enterprises
Self-host or dedicated cloud. SSO, SCIM, custom roles, and dedicated support. FeatureSignals meets you where you are.