# Atomic Clock PRO vs Clock

The clearest difference is in-app purchases: Clock at none against Atomic Clock PRO's 2. Clock also leads on ads (none vs shown) and review sentiment (84% vs 73%). Atomic Clock PRO's advantage is ratings volume (10K vs 152) and rating (4.7 vs 4.4). On price 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. Clock asks for nothing beyond the download.

Atomic Clock PRO holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 152, so its average is the more settled of the two. Written reviews complicate that: 73% of Atomic Clock PRO's written reviews are positive against 84% of Clock's, so the app with the better star average is not the one people write more warmly about.

Atomic Clock PRO ships an update every 3 months, Clock every 12 months. The most recent releases landed on September 25, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | [4.4 (152 ratings)](https://appshunter.io/ios/app/clock-simple-and-customizable/id1279486222/reviews) |
| Number of ratings | **10K** | 152 |
| Positive reviews | 72.7% of reviews | **84.5% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 months** | Every 12 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 6 MB | 2 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) | [Max-Joseph Krempl](https://appshunter.io/developer/1509598575) |

## 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


### Clock

[App page](https://appshunter.io/ios/app/clock-simple-and-customizable/id1279486222)

This app displays the time with a minimalistic design, utilizing the full screen. It offers extensive customization for time format, including 12/24 hour, leading zeros, and seconds precision. Screen brightness can be adjusted by swiping, and screen dimming can be prevented.

**Highlights:** Full-screen display, Customizable time format (12/24hr, seconds), Adjustable screen brightness, Prevent screen dimming, Minimalistic design

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

**In-app purchases:** none

**What reviewers like**

- 👍 Simple, minimalist design focused solely on displaying time
- 🆓 Completely free with no ads or in-app purchases
- 🔒 No data collection or tracking
- 🔆 Adjustable brightness/dimming feature for nighttime use
- ⏱️ Displays seconds and milliseconds options

**What reviewers complain about**

- 🐛 Settings not persisting (12/24 hour format reverts)
- 🔋 High battery consumption reported by some users
- 📱 No landscape mode option (conflicting reports)
- 🔆 Brightness controls remain visible when dimmed
- 🐛 Occasional font weight fluctuations

**Reported bugs**

- 12/24 hour format setting not saving properly
- Widget fails to display current time
- Siri cannot distinguish between this app and Apple's Clock
- App not appearing in Shortcuts app list
- Screen burn-in after extended use

**Requested features**

- Date display option (most frequently requested)
- Bold/thicker font option for better readability
- Color customization (especially red for night vision preservation)
- Widget support with live time display
- Battery percentage indicator


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Clock free?

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

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

Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Clock averages 4.4 from 152 ratings.

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

Atomic Clock PRO shows ads; Clock does not.

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

Atomic Clock PRO ships an update every 3 months, and Clock every 12 months. Most recently, Atomic Clock PRO was updated on September 25, 2026 and Clock on September 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.*