# NN Clock vs Flip Clock 3D

The clearest difference is rating: Flip Clock 3D at 4.8 against NN Clock's 3.8. Flip Clock 3D also leads on update cadence (weekly vs every 6 months) and review sentiment (100% vs 77%). NN Clock's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. Flip Clock 3D sells 1 one-off in-app purchase. NN Clock asks for nothing beyond the download.

Flip Clock 3D holds the better App Store score, 4.8 against 3.8. Both are backed by a comparable volume of ratings — 36 and 25 respectively. Written reviews point the same way: 77% of NN Clock's written reviews are positive against 100% of Flip Clock 3D's.

NN Clock ships an update every 6 months, Flip Clock 3D weekly. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | NN Clock | Flip Clock 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (36 ratings)](https://appshunter.io/ios/app/nn-clock/id510453998/reviews) | **[4.8 (25 ratings)](https://appshunter.io/ios/app/flip-clock-3d-study-time/id6670719398/reviews)** |
| Number of ratings | **36** | 25 |
| Positive reviews | 76.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 206 MB |
| Requires iOS | **6.0** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jon Juhl Nørrelykke](https://appshunter.io/developer/495299670) | [乃君 黄](https://appshunter.io/developer/1337343608) |

## What reviewers say

### NN Clock

[App page](https://appshunter.io/ios/app/nn-clock/id510453998)

This application offers a straightforward and powerful alarm clock experience with an elegant analog interface. It simplifies alarm setting and management, allowing for custom wake-up sounds and background changes. The app also integrates with HealthKit for sleep tracking.

**Highlights:** Set alarms by moving alarm hand, Swipe to dismiss alarms, Start timer by turning ring, Customizable background images, HealthKit sleep registration, 8 built-in alarm sounds, Music library integration

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and intuitive interface
- ✨ Elegant analog clock design
- 🆓 Free with no ads
- ✅ Dependable and functional
- 💡 Versatile and adjustable settings

**What reviewers complain about**

- 🐛 Background image setting broken
- 🐛 Alarm setting errors
- 🐛 App hangs on cropping screen
- 🐛 Mismatched green needle on clock face
- 🐛 No gradual alarm option

**Reported bugs**

- Setting background images doesn’t work - no OK or apply button
- Error message saying alarm could not be set
- Cannot set background, app hangs on cropping screen
- Green needle does not align perfectly with white marks
- App dims out in the middle of the night

**Requested features**

- Update app to fix background image setting
- Fix green needle alignment issue
- Add multiple alarms at the same time
- Add snooze button functionality
- Add repeating days option for alarms


### Flip Clock 3D

[App page](https://appshunter.io/ios/app/flip-clock-3d-study-time/id6670719398)

Enhance your workspace with a realistic 3D mechanical flip clock. This app helps improve focus and productivity during work or study sessions by providing a clear time display. Customize with various fonts and themes, and utilize the alarm feature when the app is active.

**Highlights:** Vivid 3D mechanical components, Adjustable viewing angles, 12/24 hour mode switching, Multiple font and theme options, Foreground alarm functionality

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all contents | $1.99 | one-time |


## Frequently asked questions

### Is NN Clock free?

NN Clock is free to download, with no in-app purchases.

### Is Flip Clock 3D free?

Flip Clock 3D is free to download, with in-app purchases available.

### Which has better reviews, NN Clock or Flip Clock 3D?

Flip Clock 3D is rated higher. NN Clock averages 3.8 out of 5 from 36 ratings, while Flip Clock 3D averages 4.8 from 25 ratings.

### Do NN Clock or Flip Clock 3D have ads?

Flip Clock 3D shows ads; NN Clock does not.

### Which is updated more often, NN Clock or Flip Clock 3D?

NN Clock ships an update every 6 months, and Flip Clock 3D weekly. Most recently, NN Clock was updated on November 6, 2026 and Flip Clock 3D on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*