# Atomic Clock PRO vs Fullscreen Clock

The clearest difference is update cadence: Fullscreen Clock at every 8 days against Atomic Clock PRO's every 3 months. Atomic Clock PRO's advantage is ratings volume (10K vs 2.2K). On price, rating, review sentiment and ads 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 Fullscreen Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Atomic Clock PRO against 4.7 for Fullscreen Clock. Both are backed by a comparable volume of ratings — 10K and 2.2K respectively. Written reviews are what separate them: 73% of Atomic Clock PRO's written reviews are positive against 76% of Fullscreen Clock's.

Atomic Clock PRO ships an update every 3 months, Fullscreen Clock every 8 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Fullscreen Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews) | [4.7 (2.2K ratings)](https://appshunter.io/ios/app/fullscreen-clock-flip-and-focus/id1403700342/reviews) |
| Number of ratings | **10K** | 2.2K |
| Positive reviews | 72.7% of reviews | **75.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 8 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 18 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Shenzhen Gude Aipu Technology Co., Ltd](https://appshunter.io/developer/1896411340) |

## 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


### Fullscreen Clock

[App page](https://appshunter.io/ios/app/fullscreen-clock-flip-and-focus/id1403700342)

Transform your device into a stylish flip clock that doubles as a productivity tool. Enhance your workspace with aesthetic widgets and utilize the integrated focus timer for improved concentration during study or work sessions.

**Highlights:** Iconic flip clock animation, Deep focus timer (Pomodoro/custom), Stunning home screen widgets, Elegant and minimalist interface, Extensive customization options, Versatile timers and stopwatch, Floating clock for iPadOS

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP | $2.99 | one-time |

**What reviewers like**

- 🚀 Efficient
- 👍 Simple and useful
- 👍 Great tool
- 👍 Excellent app
- 👍 Awesome clock

**What reviewers complain about**

- 🐛 Ads disrupt usage
- 🐛 Buggy widget
- 🔋 Drains battery
- 👎 Hard to exit
- 👎 Annoying ads

**Reported bugs**

- Widget doesn't adjust for DST
- Clock resets when exiting app
- Hangs up on some devices
- Ads cover the clock

**Requested features**

- Add color customization
- Integrate date display
- Add 12-hour time format with AM/PM
- Improve countdown timer functionality
- Add stopwatch widget


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Fullscreen Clock free?

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

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

Atomic Clock PRO and Fullscreen Clock are both rated 4.7 out of 5 on the App Store, from 10K and 2.2K ratings respectively.

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

Both Atomic Clock PRO and Fullscreen Clock show ads.

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

Atomic Clock PRO ships an update every 3 months, and Fullscreen Clock every 8 days. Most recently, Atomic Clock PRO was updated on October 1, 2026 and Fullscreen Clock on September 30, 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.*