# Atomic Clock PRO vs Chess Timer

The clearest difference is review sentiment: Atomic Clock PRO at 73% against Chess Timer's 0%. Atomic Clock PRO also leads on monetization model (free with in-app purchases vs subscription) and rating (4.7 vs 4.2). Chess Timer's advantage is ads (none vs shown) and update cadence (monthly vs every 3 months). On price, in-app purchases 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 Chess Timer sells 3 in-app purchases, starting at $3.99 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 4.2. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 37, 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 0% of Chess Timer's.

Atomic Clock PRO ships an update every 3 months, Chess Timer monthly. The most recent releases landed on October 2, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Chess Timer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | [4.2 (37 ratings)](https://appshunter.io/ios/app/chess-timer-clock-for-chess/id6458743147/reviews) |
| Number of ratings | **10K** | 37 |
| Positive reviews | **72.9% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | **Free with in-app purchases** | Subscription |
| Size | 6 MB | 9 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Kairat Amirov](https://appshunter.io/developer/1701427951) |

## 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


### Chess Timer

[App page](https://appshunter.io/ios/app/chess-timer-clock-for-chess/id6458743147)

This app provides a user-friendly and reliable timer for chess games. Customize time settings and interface themes to suit your play style, from quick blitz to long strategic matches. Perfect for casual players and tournament participants alike.

**Highlights:** Flexible time settings, Customizable interface themes, User-friendly design, Reliable and precise timing, Suitable for all players

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chess timer promo | $3.99 | per 7 days |
| Chess timer premium | $4.99 | per 7 days |
| Chess Timer Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Chess Timer free?

Chess Timer is free to download, with in-app purchases available.

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

Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Chess Timer averages 4.2 from 37 ratings.

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

Atomic Clock PRO shows ads; Chess Timer does not.

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

Atomic Clock PRO ships an update every 3 months, and Chess Timer monthly. Most recently, Atomic Clock PRO was updated on October 2, 2026 and Chess Timer on September 21, 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.*