# Atomic Clock PRO vs AClock

The clearest difference is price: Atomic Clock PRO at Free against AClock's $0.99. Atomic Clock PRO also leads on ratings volume (10K vs 10). AClock's advantage is in-app purchases (none vs 2) and ads (none vs shown). On rating and device support there is nothing between them.

Atomic Clock PRO is free to download; AClock costs $0.99 up front. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. AClock asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for Atomic Clock PRO against 4.7 for AClock. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 10, 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 100% of AClock's.

Atomic Clock PRO ships an update every 3 months, AClock fortnightly. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | AClock |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews) | [4.7 (10 ratings)](https://appshunter.io/ios/app/aclock-digital-flip-clock/id1500167033/reviews) |
| Number of ratings | **10K** | 10 |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 6 MB | 10 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Zhengzhou Sibo Intelligent Technology Co., Ltd.](https://appshunter.io/developer/803144645) |

## 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


### AClock

[App page](https://appshunter.io/ios/app/aclock-digital-flip-clock/id1500167033)

This minimalist clock app offers a customizable full-screen display with options for flip or classic digital styles. It includes productivity tools like a stopwatch, countdown, and Pomodoro timer, along with personalized features such as countdowns to important dates and customizable slogans. The app is designed for extreme power saving and eye protection with a night mode.

**Highlights:** Flip and classic digital clock styles, Stopwatch, countdown, and Pomodoro timer, Countdown to dates and anniversaries, Customizable colors, fonts, and slogans, Night mode for eye protection, 12/24 hour system support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is AClock free?

AClock costs $0.99, with no in-app purchases.

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

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

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

Atomic Clock PRO shows ads; AClock does not.

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

Atomic Clock PRO ships an update every 3 months, and AClock fortnightly. Most recently, Atomic Clock PRO was updated on September 25, 2026 and AClock on September 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*