Cirka
Smart jet lag recovery plans. Built around the science of circadian rhythms.
What it does
You enter your trip — origin, destination, flight times. Cirka builds a day-by-day plan covering pre-departure adjustment, in-flight sleep windows, light exposure timing, meal anchors, caffeine cutoffs, and post-arrival recovery.
Why it works
- Tier-based shift logic — clinically grounded thresholds. Trips under 3 hours of time-zone shift skip pre-departure adjustment entirely. Trans-oceanic flights get 7 days of recovery scaffolding.
- Direction-aware — eastbound recovers slower than westbound. Plans reflect that.
- Layover handling — multi-stop trips get dedicated layover-day items: airport walking, hydration cues, alignment meals, layover naps when appropriate.
- Adapts to check-ins — poor sleep tonight pulls tomorrow's bedtime earlier.
Privacy
Everything stays on your device. No accounts, no servers, no analytics. HealthKit access is read-only and optional. Read the full privacy policy.