Fönster: Wake Window Tracker

Naps, feeds & routine, shared

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

At 3am 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, the age range as the frame. 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 carer is always included at no extra cost. Nan 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 accounts, no ads, no tracking. LOG ONE-HANDED Sleep, breastfeeding or bottle, nappies and naps with big buttons, in dark mode — built for nights. Logging is free forever — sleep, feeds, nappies, sharing and export. What you pay for is the calculation: the next sleep window and the recalculation when they don’t settle. We work that out free for your first three days after you install. After those three days it becomes a subscription: £69.99/year or £7.99/month. If you choose the yearly plan, Apple gives you a free week before the first charge. Fönster gives general guidance from age and your own logs. It is not medical advice — talk to your health visitor if you are worried. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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See your baby’s next sleep window sooner. Setup now asks only for age and what is happening right now, so you can reach a useful answer in moments. Age-based guidance is clearly marked as a starting point. As you log more sleep, Fönster tunes the window from your baby’s real pattern and shows the first personalised result before offering Pro. Inviting another carer is simpler too: send one link and they can join the shared log without typing an invite code or creating an account. We’ve also refined sleep logging, retry states and wording throughout the app for calmer one-handed use at night.

The developer, Next Epic Co., Ltd., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Health & Fitness
    • Purchases
    • Contact Info
    • Identifiers
    • Other Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
Next Epic Co., Ltd.
Size
70.4 MB
Category
Health & Fitness
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 5 more
  • English, Danish, Finnish, Korean, Norwegian Bokmål, Swedish
Age Rating
9+
In-App Purchases
Yes
Copyright
© 2026 Next Epic Co., Ltd.