# Atomic Clock PRO vs Plus Calculator

The clearest difference is price: Atomic Clock PRO at Free against Plus Calculator's $0.99. Atomic Clock PRO also leads on update cadence (every 3 months vs every 11 months). Plus Calculator's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

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

Atomic Clock PRO ships an update every 3 months, Plus Calculator every 11 months. The most recent releases landed on September 30, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Plus Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| 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 11 months |
| Monetization | Free with in-app purchases | — |
| Size | 6 MB | 10 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [andrzej kar](https://appshunter.io/developer/1197919669) |

## 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


### Plus Calculator

[App page](https://appshunter.io/ios/app/plus-calculator/id1439014026)

**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 Plus Calculator free?

Plus Calculator costs $0.99, with no in-app purchases.

### Do Atomic Clock PRO or Plus Calculator have ads?

Atomic Clock PRO shows ads; Plus Calculator does not.

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

Atomic Clock PRO ships an update every 3 months, and Plus Calculator every 11 months. Most recently, Atomic Clock PRO was updated on September 30, 2026 and Plus Calculator on September 16, 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.*