Feature Flag Rollout Calculator
Plan gradual rollouts and test bucketing before you ship
Feature Flag Rollout Calculator plans a gradual rollout schedule using even steps or a doubling strategy, and includes a consistent bucketing tester that hashes a user ID with a genuine deterministic FNV-1a hash. It verifies live that increasing the rollout percentage only ever adds users to the bucket, never removes previously-included ones — the exact property real feature-flag systems depend on.
- →Plans gradual rollout schedules using even steps or a doubling strategy
- →Uses a genuine deterministic FNV-1a string hash, not a random number generator
- →Same user ID always produces the same bucket — verifiable and reproducible
- →Live monotonicity check confirms users are only ever added, never dropped, as rollout % rises
- →Watermarked by Cikal Studio Labs · Works on any device, no install required
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