# Atomic Clock PRO vs portier KeyOnTheGo

The clearest difference is in-app purchases: portier KeyOnTheGo at none against Atomic Clock PRO's 2. portier KeyOnTheGo also leads on ads (none vs shown). Atomic Clock PRO's advantage is update cadence (every 3 months vs every 13 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. portier KeyOnTheGo asks for nothing beyond the download.

Atomic Clock PRO ships an update every 3 months, portier KeyOnTheGo every 13 months. The most recent releases landed on September 23, 2026 and May 18, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | portier KeyOnTheGo |
| --- | --- | --- |
| 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** | Every 13 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 42 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [portier Global Pty Ltd](https://appshunter.io/developer/1791711100) |

## 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


### portier KeyOnTheGo

[App page](https://appshunter.io/ios/app/portier-keyonthego/id6740809294)

**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 portier KeyOnTheGo free?

portier KeyOnTheGo is free to download, with no in-app purchases.

### Do Atomic Clock PRO or portier KeyOnTheGo have ads?

Atomic Clock PRO shows ads; portier KeyOnTheGo does not.

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

Atomic Clock PRO ships an update every 3 months, and portier KeyOnTheGo every 13 months. Most recently, Atomic Clock PRO was updated on September 23, 2026 and portier KeyOnTheGo on May 18, 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.*