Fönster: Wake Window Tracker

At 3 a.m. you don't want a dashboard. You want one answer: when should they sleep next? Fönster calculates the next sleep window instantly — from age and your own logs, using the age range as a starting point. Didn't fall asleep? One tap recalculates a new window on the spot. No rigid sleep schedule to set up — the wake window is the schedule, tuned to your baby's own bedtime rhythm. A baby tracker that answers instead of asking. No forms. No waiting days. ON YOUR LOCK SCREEN The next window sits on your Lock Screen and Home Screen — you don't even open the app. The countdown updates itself, and when the other parent starts a sleep, your widget says who did it. No notification. Nothing that wakes anyone. BUILT FOR TWO Invite the other parent with a link — no account needed. You see the same log instantly, and either of you can start and end a sleep without "another user" errors. The second caregiver is always included at no extra cost. Grandma can have read-only mode. YOUR DATA IS YOURS Everything lives on your phone first. Export (CSV) works even without a subscription. We never hold old data hostage. No account to create. No ads. LOG ONE-HANDED Sleep, breastfeeding or bottle, diapers and naps with big buttons, in dark mode — built for nights. Logging is free forever — sleep, feeds, diapers, sharing and export. What you pay for is the calculation: the next sleep window and the recalculation when they don't settle. Your first personalized sleep window is included. After that preview it becomes a subscription: $39.99/year or $7.99/month. The yearly plan starts with a 14-day free trial, then renews automatically unless you cancel in the App Store. Fönster gives general guidance from age and your own logs. It is not medical advice — talk to your pediatrician if you are worried. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/