Feature flags

Feature flag services let you switch code paths on and off at runtime, roll a change out to a share of users and run experiments without a redeploy. ConfigCat, Flagsmith and Rollgate focus on flags and remote config; GrowthBook and Statsig add experiment analysis; Hypertune offers typed flags evaluated in memory and versioned like code.

Limits fall on three axes: number of flags, evaluation requests and seats. ConfigCat allows 10 flags, 5M requests a month and 2 environments with no cap on team members. Rollgate gives 500,000 requests and 3 users with unlimited flags, GrowthBook unlimited flags for 3 users, and Statsig 1M events a month with unlimited seats.

Request quotas depend on how the SDK works. SDKs that download the flag set and evaluate it locally use far fewer requests than ones that call the API for every check. GrowthBook, Abby and Flagsmith can also be self-hosted, which removes usage caps. Check the plan page before relying on a limit, since flag counts are often the first thing to change.