Open Source & Self-Hosted
Feature flags that stay
on your infrastructure
Open-source, self-hosted feature flag platform. Ship features safely with full control — no vendor lock-in, no data leaving your network.
Everything you need
A complete feature flag platform that runs entirely on your infrastructure.
On-Premise
Your data stays on your servers. Full compliance, zero third-party access.
Targeting Rules
Target by user ID, attributes, or roll out to a percentage of users.
Multi-Environment
Isolated dev, staging, and production environments with scoped API keys.
Blazing Fast
SQLite-powered evaluation in sub-millisecond. No external database required.
REST API
Simple HTTP API for flag management and evaluation. Batch support included.
Admin Dashboard
Built-in web UI to manage projects, environments, and flags visually.
Simple by design
One API call to evaluate a flag. That's it.
# Create a flag
curl -X POST /api/flags \
-H "Authorization: Bearer ff_your_key" \
-d '{"key": "dark-mode", "name": "Dark Mode"}'
# Evaluate it
curl -X POST /api/evaluate/dark-mode \
-H "Authorization: Bearer ff_your_key" \
-d '{"userId": "user-42"}'
→ { "enabled": true }Up and running in 30 seconds
Three steps from zero to feature flags.
Install
npx flagforge init or clone the repo. One command, no config.
Configure
Create projects, environments, and flags from the admin dashboard.
Ship
Evaluate flags via REST API or client SDKs. Roll out safely to any percentage.
How FlagForge compares
See how we stack up against popular alternatives.
| FlagForge | LaunchDarkly | Unleash | |
|---|---|---|---|
| Self-hosted | ✓ | ✗ | ✓ |
| Open source | MIT | ✗ | Partial |
| Pricing | Free | From $8.33/seat/mo | From $0 (limited) |
| External deps | None | N/A | PostgreSQL |
| Setup time | 30 seconds | N/A | Minutes |
| Targeting | ✓ | ✓ | ✓ |
| Multi-env | ✓ | ✓ | ✓ |
Official SDKs
Drop-in client libraries for your stack.
Python, Go, and more coming soon
Why self-hosted?
Your infrastructure, your rules.
Compliance
Your data never leaves your network. Meet regulatory requirements without compromise.
Cost
Free forever. No per-seat pricing, no usage limits, no surprise bills.
Control
No vendor lock-in. MIT licensed. Fork it, extend it, make it yours.
Built in the open
FlagForge is MIT licensed and community-driven. Star us on GitHub, open an issue, or submit a PR.
Star on GitHub