# Atomic Clock PRO vs Kitty Clock

The clearest difference is rating: Atomic Clock PRO at 4.7 against Kitty Clock's 1.0. Atomic Clock PRO also leads on ratings volume (10K vs 1). Kitty Clock's advantage is update cadence (fortnightly vs every 3 months) and iOS requirement (12.0 vs 15.6). On price, ads, in-app purchases and monetization model 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 Kitty Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Atomic Clock PRO holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 1, so its average is the more settled of the two.

Atomic Clock PRO ships an update every 3 months, Kitty Clock fortnightly. The most recent releases landed on September 23, 2026 and July 26, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Kitty Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/kitty-clock/id6451078399/reviews) |
| Number of ratings | **10K** | 1 |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 46 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Mihoko Araki](https://appshunter.io/developer/1476136915) |

## 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


### Kitty Clock

[App page](https://appshunter.io/ios/app/kitty-clock/id6451078399)

Customize your device's display with a charming clock featuring adorable kitten images. Personalize the time text, clock hands, and kitten placement, with options to adjust size, format, and even set custom time signals. Enjoy a visually appealing and functional timepiece.

**Highlights:** 20 different kitten pictures, Movable time text, analog clock, and kitten, Zoomable analog clock and kitten, Adjustable font size and display elements, Customizable time signal tones, Screen rotation support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kitty Clock with no ads | $1.99 | one-time |


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Kitty Clock free?

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

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

Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Kitty Clock averages 1.0 from 1 ratings.

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

Both Atomic Clock PRO and Kitty Clock show ads.

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

Atomic Clock PRO ships an update every 3 months, and Kitty Clock fortnightly. Most recently, Atomic Clock PRO was updated on September 23, 2026 and Kitty Clock on July 26, 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.*