Pay once, own-forever.
Run an OpenFeature compatible feature flag server on your own machine, then use your existing Git workflows (branches, pull requests) to manage feature flag config and state in YAML or JSON files entirely in your own Git repo.
Use any OpenFeature client SDK (or create your own) to get standard feature flag functionality – user segmentation, percentage rollouts, A/B testing, REST API, live streaming flag states, and more...
Oh, and when you buy you get the source code too. Halyard is written in Go.
Early access starting in 2025