# PowerNap: Nap Timer & Alarm — Learns your perfect nap length

> Learns your perfect nap length (iPhone/iPad app by RUMAHSAKU CORP..)

- Source: https://appshunter.io/ios/app/powernap-nap-timer-and-alarm/id6787592785 (this page in markdown: same URL + `.md`)
- Developer: [RUMAHSAKU CORP.](https://appshunter.io/developer/1828221168)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: Arabic, English, French, German, Indonesian, Italian, Japanese, Korean, Malay, Portuguese and 5 more
- Released: 2026-07-08
- Data updated: 2026-09-09
- User reviews in markdown: https://appshunter.io/ios/app/powernap-nap-timer-and-alarm/id6787592785/reviews.md

## What is PowerNap?

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.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| PowerNap Pro | $4.99 | one-time |



## Version history (last 5 releases)

### 1.0.4 — 2026-09-08

• 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.

### 1.0.3 — 2026-08-09

Minor bug fixes

### 1.0.2 — 2026-08-07

Fixed an issue where Japanese text could occasionally appear instead of the selected app language.

### 1.0.1 — 2026-07-13

Bug fix

### 1.0 — 2026-07-09

No release notes.

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## More apps by RUMAHSAKU CORP.

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All apps by RUMAHSAKU CORP.: https://appshunter.io/developer/1828221168

## Related topics

[powernap](https://appshunter.io/ios/topics/powernap) · [nap timer](https://appshunter.io/ios/topics/nap-timer) · [nap power](https://appshunter.io/ios/topics/nap-power) · [power nap timer](https://appshunter.io/ios/topics/power-nap-timer) · [nap buddy timer](https://appshunter.io/ios/topics/nap-buddy-timer) · [power nap app](https://appshunter.io/ios/topics/power-nap-app)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*