Feature flag use cases
The practical patterns teams reach for once flags are in place. How each one works, where it fits, and how to run it with Featureflip.
Progressive rollouts
Ship a new feature to 1% of users first, watch the metrics, then expand in steps. The percentage is a dashboard setting, not a redeploy, and the same users stay in the cohort as you ramp.
Limit blast radius · real production signal · roll back in seconds
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Feature flag kill switch
Wrap a risky or expensive code path in a flag so you can disable it instantly in production. Flip it off and every SDK serves the safe fallback within seconds, with no rebuild or rollback.
Mitigate in seconds · scoped to one feature · fail-safe defaults
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A/B testing
Serve two variations to a sticky 50/50 split and log who saw which one. The flag delivers the experiment, holds users in their group, and records exposure; your analytics decide the winner.
Sticky bucketing · exposure tracking · test becomes the rollout
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Entitlements
Gate a paid feature by plan tier with a targeting rule on the plan you pass at evaluation. Move a feature between tiers from the dashboard, override a single customer, and keep billing as the source of truth for the plan.
Plan-tier gating · per-customer overrides · no deploy to re-package
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Beta programs
Ship the beta code with the flag off, then opt testers in, hand-pick early access, and widen the cohort from the dashboard. The flag decides who is in the beta; your feedback and analytics tools own what they think.
Opt-in cohorts · named early testers · roll back in seconds
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Feature flags for AI
Keep the model name, system prompt, and settings in a JSON flag. Swap models with no deploy, migrate a new one in gradually, route per tenant, and kill a bad model in seconds. The flag owns the config; your eval tools own the quality.
Model kill switch · gradual migration · per-tenant routing
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New to feature flags?
Start with the concept guide for how flags, variations, environments, and the evaluation model fit together — then come back for the patterns.
Ready to ship behind a flag?
Start free on the Solo plan — 10 flags, 2 environments, no credit card.