Flagsmith
Dev Utilities Free tier (card may be required)
Documentation: docs.flagsmith.com ยท Checked Sep 13, 2026
About
Flagsmith is a feature-flag and remote-config service that lets you toggle features and roll out changes without redeploying code. The free cloud plan includes 50,000 requests per month, one team member, and unlimited feature flags, environments, identities, and segments. If you self-host the open-source version, there are no limits on users, flags, or environments at all. SDKs cover every major language and framework.
Details
Free tier, but a card may be required to sign up.
Auth: Free tier (card may be required)
Rate limit: Cloud free: 50,000 requests per month, 1 team member, unlimited flags and environments. Self-hosted: unlimited.
Verified: 2026-09-13
Best for: feature flags gradual rollouts remote config
Setup
- Sign up for free cloud or self-host with Docker.
- Create a project and an environment.
- Create a feature flag in the dashboard.
- Copy your environment API key.
- Evaluate flags in your app with the SDK or the REST API.
curl https://edge.api.flagsmith.com/api/v1/flags/ -H "X-Environment-Key: YOUR_ENV_KEY"Use cases
- Roll out a new feature to a small percentage of users first.
- Turn off a broken feature instantly without a deploy.
- Run A/B tests by serving different flag values to different users.