FeatureSignalsFeature flags
without the $50K bill
FeatureSignals is an open-source feature management platform with A/B experimentation, real-time updates, and SDKs for every stack. Self-hosted on your infrastructure.
14-day Pro trial included. Self-host or use our cloud. Open source, Apache 2.0.
git clone https://github.com/dinesh-g1/featuresignals
cd featuresignals
docker compose up -d
# Evaluate flags from any language
import featuresignals from '@featuresignals/node';
const client = featuresignals.init('sdk-key', { envKey: 'production' });
client.boolVariation('new-checkout', user, false);
Why FeatureSignals?
Everything your engineering team needs. No vendor lock-in.
100% Free & Open Source
Apache-2.0 licensed. No per-seat pricing. No per-MAU charges. Self-host on a $10/month VPS.
A/B Experimentation
Built-in variant assignment with consistent hashing, weighted splits, and impression tracking.
Real-Time Updates
SSE streaming pushes flag changes to SDKs instantly. Sub-10ms local evaluation.
SDKs for Every Stack
Go, Node.js, Python, Java, C#, Ruby, React, Vue. All with OpenFeature providers for zero vendor lock-in.
Enterprise Ready
RBAC, audit logs, approval workflows, webhooks, kill switches, and mutual exclusion groups.
Deploy Anywhere
Docker Compose, VPS, Kubernetes. Plus a relay proxy for edge deployments. Single Go binary.
Built for developers, by developers
Everything you need to ship features safely. Nothing you don't.
Boolean, string, number, JSON, A/B
Go, Node, Python, Java, C#, Ruby, React, Vue
eq, neq, contains, in, regex, gt...
Consistent hashing, 0.01% granularity
Run safe, non-overlapping experiments
Emergency disable in one click
Edge caching, low-latency evaluation
CI tool to find unused flags in code
Ready to ship faster?
Start a free trial with sample data, or self-host in under 5 minutes.