# Atomic Clock PRO vs Simple_Clock

The clearest difference is update cadence: Simple_Clock at every 5 days against Atomic Clock PRO's every 3 months. Atomic Clock PRO's advantage is ratings volume (10K vs 127) and iOS requirement (15.6 vs 17.0). 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 Simple_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 Simple_Clock. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 127, 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 71% of Simple_Clock's.

Atomic Clock PRO ships an update every 3 months, Simple_Clock every 5 days. Both last shipped on September 23, 2026.

## The numbers

| Metric | Atomic Clock PRO | Simple_Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews) | [4.7 (127 ratings)](https://appshunter.io/ios/app/simple-clock/id6477709832/reviews) |
| Number of ratings | **10K** | 127 |
| Positive reviews | **72.7% of reviews** | 70.6% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 42 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Seung-Un Ham](https://appshunter.io/developer/447543367) |

## 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


### Simple_Clock

[App page](https://appshunter.io/ios/app/simple-clock/id6477709832)

A minimalist analog clock designed with a classic Apple iPad aesthetic. It offers the unique ability to integrate calendar events and reminders as clock hands for enhanced time management.

**Highlights:** Classic Apple iPad style analog clock, Optional calendar integration as clock needles, Optional reminders integration as clock needles, Minimalist design

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads (Lifetime) | $2.99 | one-time |


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Simple_Clock free?

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

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

Atomic Clock PRO and Simple_Clock are both rated 4.7 out of 5 on the App Store, from 10K and 127 ratings respectively.

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

Both Atomic Clock PRO and Simple_Clock show ads.

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

Atomic Clock PRO ships an update every 3 months, and Simple_Clock every 5 days. Most recently, Atomic Clock PRO was updated on September 23, 2026 and Simple_Clock on September 23, 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.*