Flags evaluated in-process. Updates pushed in under 50 ms. No vendor, no round-trips, no latency tax.
Flags are evaluated entirely in-process from an in-memory store. Zero network latency on every isEnabled() call — no HTTP round-trips, no polling.
Deploy on your own infrastructure with Docker. Your flag data never leaves your servers. Single binary, PostgreSQL, and Redis are all you need.
Flag changes propagate instantly to all connected SDK clients through Server-Sent Events. No polling interval — changes land in milliseconds.
Target users by any attribute — email domain, plan, region, custom properties. Reusable segments, string and numeric operators, prerequisite flags, and sticky percentage rollouts.
Multivariate flags with weighted splits, impression tracking, exposure dashboards, and an experiments beta that measures conversion goals with statistical significance.
One evaluation engine written in Rust, compiled to native code (NAPI for Node.js, WASM for browsers, FFI for Flutter/React Native) — identical flag decisions everywhere.
Native SDKs, a type-safe codegen CLI, edge evaluation (Cloudflare Workers, Fly.io), SSR/bootstrap helpers, and infrastructure-as-code via a Terraform provider and Kubernetes operator.
No black boxes, no usage limits, no surprise pricing. Fork it, extend it, and own your feature flag infrastructure completely.