# Atomic Clock PRO vs World Clock

The clearest difference is in-app purchases: World Clock at none against Atomic Clock PRO's 2. World Clock also leads on update cadence (monthly vs every 4 months) and review sentiment (87% vs 73%). Atomic Clock PRO's advantage is ratings volume (10K vs 600). On price, rating, ads 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. World Clock asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Atomic Clock PRO against 4.8 for World Clock. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 600, so its average is the more settled of the two. Written reviews are what separate them: 73% of Atomic Clock PRO's written reviews are positive against 87% of World Clock's.

Atomic Clock PRO ships an update every 4 months, World Clock monthly. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | World Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews) | **[4.8 (600 ratings)](https://appshunter.io/ios/app/world-clock-timezone-converter/id1425332311/reviews)** |
| Number of ratings | **10K** | 600 |
| Positive reviews | 72.9% of reviews | **86.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 6 MB | 34 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) | [Bokeria](https://appshunter.io/developer/1425332310) |

## What reviewers say

### Atomic Clock PRO

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

This app provides highly accurate time by syncing with official atomic clock servers. Customize your display with digital or analog views, personal backgrounds, and adjustable sizes. It's perfect for precise timekeeping, travel, or as a personalized desk clock.

**Highlights:** Atomic clock time synchronization, Digital and analog display options, Customizable backgrounds, Adjustable clock size, Automatic time zone recognition, Screen always on option

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


### World Clock

[App page](https://appshunter.io/ios/app/world-clock-timezone-converter/id1425332311)

Easily compare world times and convert dates and times across different cities and time zones. Ideal for international meetings, travel, or staying connected with loved ones abroad. Offers widgets for quick access and customizable themes.

**Highlights:** Compare multiple cities and time zones, Convert dates and times across regions, Check UTC and standard time zones, Add widgets for fast world time checks, See day and night indicators, Choose 12-hour or 24-hour format, Select from multiple theme colors

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and intuitive user interface
- 🆓 Free application with no paywall
- 🌍 Comprehensive timezone and city database
- ⚡ Fast app performance and quick load times
- 🔄 Automatic daylight saving time updates

**What reviewers complain about**

- 🐛 Widget displays incorrect or blank times
- 🐛 Time display stuck or frozen
- ⚠️ Daylight saving time handling issues
- 🐛 Night mode compatibility problems
- 🐛 Screen flickering when scrolling

**Reported bugs**

- Widget showing blank screen instead of times
- Widget time display stuck or frozen
- Incorrect time display after daylight saving changes
- Widget not working on night mode
- Screen flickering when scrolling

**Requested features**

- Alarm functionality for multiple timezones
- Larger widget size options (2x2, 3x3)
- Widget theme/color customization
- Seconds display in time
- Real-time minute updates


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is World Clock free?

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

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

World Clock is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while World Clock averages 4.8 from 600 ratings.

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

Both Atomic Clock PRO and World Clock show ads.

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

Atomic Clock PRO ships an update every 4 months, and World Clock monthly. Most recently, Atomic Clock PRO was updated on November 1, 2026 and World Clock on October 29, 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.*