# Atomic Clock PRO vs Dinggly Cumulus

The clearest difference is in-app purchases: Dinggly Cumulus at none against Atomic Clock PRO's 2. Dinggly Cumulus also leads on ads (none vs shown) and update cadence (fortnightly vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. Dinggly Cumulus asks for nothing beyond the download.

Atomic Clock PRO ships an update every 3 months, Dinggly Cumulus fortnightly. The most recent releases landed on October 1, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Dinggly Cumulus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | — |
| Number of ratings | **10K** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 3 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Dinggly Limited](https://appshunter.io/developer/1144828785) |

## 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


### Dinggly Cumulus

[App page](https://appshunter.io/ios/app/dinggly-cumulus/id6742791383)

**Features:** macOS Compatibility

**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 Dinggly Cumulus free?

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

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

Atomic Clock PRO shows ads; Dinggly Cumulus does not.

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

Atomic Clock PRO ships an update every 3 months, and Dinggly Cumulus fortnightly. Most recently, Atomic Clock PRO was updated on October 1, 2026 and Dinggly Cumulus on September 10, 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.*