Free Tools
Tools for shipping with confidence
Free, open calculators built by people who run experiments for a living. No signup, no email gate, no upsell modal.
Feature Flag Cost Calculator
Estimate your LaunchDarkly, Flagsmith and Unleash bill from team size, services and MAU, and compare it to ShipSilently's flat $49/mo. Pricing re-verified quarterly.
Open calculator →A/B Test Calculator
Plan an experiment with sample size and minimum detectable effect, or analyze results with a two-proportion z-test, p-value, and confidence interval.
Open calculator →Bayesian A/B Tester
Posterior probability that B beats A and expected loss for any number of variants. Coming soon.
Coming soonSLO & Error Budget Calculator
Translate an SLO target into the minutes-per-month error budget you can spend on rollouts. Coming soon.
Coming soonFlag Shift Game
Take a break: a free arcade platformer where the only button is a feature flag. Toggle it to flip the world, and survive.
Play now →