# Smart Nap: Power Nap Alarm — Sleep Detection & Wake Alarm

> Smart nap timer with Apple Watch sleep detection and wake cutoff. (iPhone/iPad app by Sources Knight.)

- Source: https://appshunter.io/ios/app/smart-nap-power-nap-alarm/id6804064599 (this page in markdown: same URL + `.md`)
- Developer: [Sources Knight](https://appshunter.io/developer/6804064601)
- Category: Health & Fitness, Productivity
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 17+
- Requires: iOS 26.0 · 68 MB
- Languages: American English, Japanese
- Released: 2026-09-21
- Data updated: 2026-10-14
- Monetization: freemium

## What is Smart Nap?

Choose how long you want to nap and the latest time you want to wake. Smart Nap automatically estimates sleep onset using a compatible paired Apple Watch, then starts timing your nap. You can also start the timer manually on iPhone.

Your initial alarm respects your wake-time cutoff. If you choose Snooze, the extra time can extend beyond that cutoff.

HOW IT WORKS

1. Set two things: how long you want to sleep, and the latest time you must be awake.
2. Lie down. Smart Nap estimates sleep onset using your Apple Watch.
3. The initial alarm is set for whichever comes first — your nap duration after estimated onset, or your cutoff.

That cutoff is the whole point. If a 90-minute nap would end at 18:15 but your cutoff is 18:00, Smart Nap sets the initial alarm for 18:00. You can still choose Snooze when it rings.

HOW IT KNOWS

Your Apple Watch establishes a heart-rate baseline near the start of your nap, then looks for changes in heart rate, heart-rate variability and movement that suggest sleep onset. Smart Nap uses estimated onset times from previous naps and your optional feedback to adjust detection.

SIX SMART PRESETS

• Power — 20 min, a quick reset
• Focus — 30 min, clear your head
• Flow — 45 min, creative boost
• Balance — 1 hour, steady recharge
• Deep — 1h 30m, a longer rest
• Recovery — 2 hours, a long reset

Or dial in any duration and any cutoff you want.

SEE WHAT ACTUALLY HAPPENED

Each session records its start time, estimated sleep onset when available, time to fall asleep, recorded wake time, your target, and your cutoff. Estimated sleep efficiency is scored per nap and charted over weeks, so you can explore which nap length works for you.

WRIST ALERTS

The Watch app uses heart rate, heart-rate variability and movement to estimate sleep onset, then alerts you with wrist haptics and optional sound.

YOUR HEALTH DATA STAYS ON YOUR DEVICES

Smart Nap reads heart rate and HRV from Apple Health and movement from Apple Watch to estimate sleep onset. These health and sensor readings are processed on your iPhone and Apple Watch. They are not uploaded to a server, sold, or used for advertising.

WHO IT'S FOR

Shift workers who need a controlled nap before a night on. Students napping between classes. Parents grabbing a window while the baby sleeps. Anyone who has ever set a 25-minute alarm and woken up two hours later in the dark.

REQUIREMENTS

Smart Nap runs on iPhone with iOS 26 or later. Automatic sleep-onset detection requires a paired Apple Watch running watchOS 26 or later. Without one, Smart Nap runs as a manual-start nap timer with the same cutoff for the initial alarm.

SUBSCRIPTION

Your first nap is free, no subscription needed. After that, Smart Nap Pro unlocks unlimited naps with sleep-onset detection and your full nap history through weekly or annual subscriptions. Eligible users can get a 3-day free trial on the annual plan. See the app for available offers and local pricing. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple Account settings.

Terms of Use: https://sourcesknight.com/apps/smart-nap/terms-of-use/
Privacy Policy: https://sourcesknight.com/apps/smart-nap/privacy-policy/

## Key features

- Automatic sleep onset detection
- Customizable nap duration
- Strict wake-up cutoff
- Apple Watch integration
- Nap history and efficiency tracking
- Six smart nap presets

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Sleep Detection Weekly | $7.99 | per 7 days |
| Sleep Detection Yearly | $29.99 | per year |


## Is Smart Nap safe?

Not enough ratings yet to assess Smart Nap.

## Is Smart Nap legit?

Smart Nap: Power Nap Alarm has limited verification signals. The AppsHunter Legitimacy Score for Smart Nap is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Frequently asked questions about Smart Nap

### Does Smart Nap have ads?

No, Smart Nap does not contain advertisements. The app is ad-free, ensuring an uninterrupted user experience.

### How does Smart Nap detect sleep onset?

Smart Nap uses a paired Apple Watch to establish a heart-rate baseline and monitors changes in heart rate, heart-rate variability, and movement to estimate when you fall asleep.

### What are the subscription options for Smart Nap Pro?

Smart Nap Pro offers unlimited naps with sleep-onset detection and full nap history. Subscriptions are available weekly or annually, with a 3-day free trial for the annual plan for eligible users.

### Can I use Smart Nap without an Apple Watch?

Yes, without an Apple Watch, Smart Nap functions as a manual-start nap timer. You can still set your desired duration and wake-up cutoff for the initial alarm.

### What is the age rating for Smart Nap?

Smart Nap has an age rating of 17+. This is likely due to the health data processing and potential for advanced features.

### How often is Smart Nap updated?

The app was last updated on September 22, 2026, indicating recent development activity. Specific update frequency is not detailed, but it is actively maintained.

### What devices is Smart Nap compatible with?

Smart Nap runs on iPhone with iOS 26 or later. Automatic sleep-onset detection requires a paired Apple Watch running watchOS 26 or later.

### What happens if my nap duration plus estimated sleep onset goes past my cutoff time?

If your nap duration after estimated sleep onset would end past your set cutoff time, Smart Nap will set the initial alarm for the cutoff time. You can still choose to snooze when the alarm rings.

## Version history (last 2 releases)

### 1.1 — 2026-10-09

• Improved stability and fixed issues with alarms.
• Added Japanese language support.
• Added a short guide to Apple Watch sleep-onset estimates and starting the nap timer manually on iPhone.

### 1.0 — 2026-09-22

No release notes.

## Apps similar to Smart Nap

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [PowerNap: Nap Timer & Alarm](https://appshunter.io/ios/app/powernap-nap-timer-and-alarm/id6787592785) | — | Free | Health & Fitness |
| [NapBoost](https://appshunter.io/ios/app/napboost/id6760869553) | — | Free | Health & Fitness |
| [TimeSleep: Sleep & Snore Alarm](https://appshunter.io/ios/app/timesleep-sleep-and-snore-alarm/id6806303035) | — | Free | Health & Fitness |
| [PowerNapTime: Smart Naps](https://appshunter.io/ios/app/powernaptime-smart-naps/id6804314448) | — | Free | Health & Fitness |
| [NapSense](https://appshunter.io/ios/app/napsense/id6751795511) | — | Free | Health & Fitness |
| [FormLab](https://appshunter.io/ios/app/formlab/id6758761079) | — | Free | Health & Fitness |

## Related topics

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

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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 2026-10-14.*