PowerNap: Nap Timer & Alarm
Learns your perfect nap length
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Your lunch break ends at a fixed time. So the real question isn't "how long should I nap" — it's "by when should I lie down?"
PowerNap is a nap timer built around the watch on your wrist. It estimates sleep onset from heart rate and motion. It starts with a standard 15-minute suggestion. After 5 valid assessments, it uses your history to suggest a duration from 10 to 20 minutes and works backwards from your fixed wake-up time to tell you when to lie down.
HOW IT WORKS
1. Set your wake-up time (e.g. 12:55)
2. Lie down by the suggested time and tap Start Nap on your watch
3. Heart rate + stillness estimate sleep onset — no tapping needed
4. Confirm whether you slept and rate grogginess, then rate return-to-work readiness about 30 minutes later
After 5 assessed naps, history-based suggestions begin.
MADE FOR YOUR WRIST
- PowerNap estimates sleep onset from a sustained heart-rate drop and continuously observed stillness. Resting while awake can still resemble sleep.
- Last night's sleep duration, resting heart rate and HRV shown as reference information
- Backup notifications on both watch and iPhone
- Without sufficient heart-rate data, no sleep estimate is made; the scheduled alarm still works.
TRACK AND UNDERSTAND
- Every nap recorded automatically: estimated onset and sleep duration, heart-rate curve
- Wake-up and 30-minute assessments, weekly charts and start-time patterns
- Insights based on your own answers and history
- The heart-rate graph for your latest completed, non-cancelled nap is included without a purchase. Access moves to the next completed nap; older graphs require Pro.
- Sleep totals and averages include estimates only when you confirm that you slept. No, unsure and unanswered records are excluded.
POWERNAP PRO (ONE-TIME PURCHASE)
A one-time Pro purchase unlocks history-based suggestions, older heart-rate graphs, history charts and insights. No subscription.
With Pro, optionally wake before the scheduled alarm when the estimated sleep duration reaches your target.
PRIVATE BY DESIGN
Nap, heart-rate and assessment records are processed on your devices and are not sent to our servers. No ads, tracking or accounts. Purchases communicate with Apple through StoreKit.
- Requires a watch running watchOS 10 or later
- PowerNap is not a medical device and is not intended to diagnose or treat any condition. Sleep onset is estimated from heart rate and motion.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Sleep-onset estimation now requires a sustained heart-rate drop as well as stillness.
• Results and sleep-time totals reflect your answer about whether you slept.
• View the heart-rate graph for your latest completed, non-cancelled nap without a purchase.
• Improved Apple Watch readability and alarm reliability when sensor data is unavailable.
The developer, RUMAHSAKU CORP., 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 Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- RUMAHSAKU CORP.
- Size
- 10.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 14 more
- English, Arabic, French, German, Indonesian, Italian, Japanese, Korean, Malay, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- PowerNap Pro $4.99
- Copyright
- © RUMAHSAKU CORP.