Flagsmith

Flagsmith is a developer tools tool for building and shipping software. In its own words: Flagsmith makes it easy to create and manage feature flags. Roll out, segment, and optimise. Stay secure with on-premise and private cloud hosting.

What the free plan gives you

Free plan with 50k requests/month. Taken from Flagsmith's own pricing page, the free plan includes ship Faster & Control Releases; start using Flagsmith for free; pay Yearly (Save >10%); feature flags for building.

Because Flagsmith is open source, the ceiling is your own infrastructure rather than a billing page. Self-hosting costs nothing but your time, and a hosted plan is there if you would rather not run it.

What it does

Flagsmith covers feature flags, remote config, remote application management, test changes without deployments, available in many languages.

When you would pay

You may never need to. The free tier is not a funnel step here, so the sensible move is to use it until something it genuinely cannot do forces the question.

We list Flagsmith because the free plan was checked against its own pricing page, not because a vendor asked. If it has changed, tell us and we will re-check it.