# Atomic Clock PRO vs Flip Clock

The clearest difference is rating: Atomic Clock PRO at 4.7 against Flip Clock's 3.5. Atomic Clock PRO also leads on ratings volume (10K vs 11) and review sentiment (73% vs 63%). Flip Clock's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 3 months). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month and Flip Clock sells 7 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Atomic Clock PRO holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 73% of Atomic Clock PRO's written reviews are positive against 63% of Flip Clock's.

Atomic Clock PRO ships an update every 3 months, Flip Clock every 2 weeks. The most recent releases landed on October 2, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Flip Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | [3.5 (11 ratings)](https://appshunter.io/ios/app/flip-clock-timer-and-widget/id6740893494/reviews) |
| Number of ratings | **10K** | 11 |
| Positive reviews | **72.9% of reviews** | 62.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 310 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [HK SHENGUANGYUAN TECH LIMITED](https://appshunter.io/developer/1851942593) |

## What reviewers say

### Atomic Clock PRO

[App page](https://appshunter.io/ios/app/atomic-clock-pro/id899090224)

Get the most accurate time from an official atomic clock server. This app automatically detects your time zone and allows custom backgrounds. Easily switch between digital and analog clock displays with a swipe.

**Highlights:** Exact time from atomic clock, Automatic time zone recognition, Customizable background images, Digital and analog clock modes, Optional sound alerts, Color customization

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per month |
| Remove Ads | $5.99 | one-time |

**What reviewers like**

- ⭐ Accurate time display
- 📟 Useful for timing events
- 🕰️ Helpful for setting other clocks
- 🔍 Large, easy-to-read clock face

**What reviewers complain about**

- 💸 Subscription model for ad-free version
- 📢 Excessive advertisements
- 🔍 Small font for seconds display
- 🔀 Difficulty in displaying both analog and digital clocks simultaneously

**Reported bugs**

- Second hand occasionally runs in reverse
- Digital clock display cuts off on some devices
- Inconsistent behavior when switching between clock types

**Requested features**

- Customizable clock face options
- Ability to set widget on home screen
- Sync with system clock to automatically update time


### Flip Clock

[App page](https://appshunter.io/ios/app/flip-clock-timer-and-widget/id6740893494)

Enhance your device with a classic flip clock display and customizable widgets. Stay focused with a built-in Pomodoro timer for work and study. Personalize your timekeeping experience with various themes and effects.

**Highlights:** Customizable flip clock widgets, Full-screen clock display, Pomodoro timer for focus, Floating clock over other apps, Multiple widget sizes, 12/24 hour format

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week(1 Week) | $0.99 | per 7 days |
| Week(1 Week) | $4.99 | per 7 days |
| Week Plan(1 Week) | $14.99 | per 7 days |
| Week(1 Week) | $14.99 | per 7 days |
| Week Plan(1 Week) | $14.99 | per 7 days |
| Month Plan(1 Month) | $19.99 | per month |
| Annual Plan(1 Year) | $69.99 | per year |


## Frequently asked questions

### Is Atomic Clock PRO free?

Atomic Clock PRO is free to download, with in-app purchases available.

### Is Flip Clock free?

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

### Which has better reviews, Atomic Clock PRO or Flip Clock?

Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Flip Clock averages 3.5 from 11 ratings.

### Do Atomic Clock PRO or Flip Clock have ads?

Atomic Clock PRO shows ads; Flip Clock does not.

### Which is updated more often, Atomic Clock PRO or Flip Clock?

Atomic Clock PRO ships an update every 3 months, and Flip Clock every 2 weeks. Most recently, Atomic Clock PRO was updated on October 2, 2026 and Flip Clock on September 27, 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.*