[ljm]

I think openfeature.dev is an attractive proposition these days - start off with an env-based provider or roll your own and if you get to a point where you need to buy, you only need to swap over a provider (or use a multi-provider).

[selfmodruntime]

I like openfeature. Initially I thought that it was overengineered and quote honestly, I never grew to a size where I had to use anything but an env-provider paired with out CI/CD pipeline. But it gave me security that A/B testing would be possible if needed, and, more importantly, we had a unified API for feature flags and they were all defined in one place.