I'll second GrowthBook. I was able to drop out of a LaunchDarkly subscription that was costing thousands of dollars per month and into a nice, cozy $29 Growthbook plan with zero loss in fidelity, while also increasing capabilities.

Growthbook has a Chrome dev plugin that allows you to simulate feature flags and value changes without having to modify the actual flags and watch the page update in response to the flag changes, which made it not only cheaper than LaunchDarkly, but markedly better to work with.

I love growthbook! We’re building a different kind of feature flag framework - one that is for b2b and connects to your billing and pricing systems (because which feature is enabled is connected to what the user paid for).

What's up with those pricing plans? it goes from $0 (3 users) to $80 ($20 per user for 4+ users) per month.