# Atomic Clock PRO vs Five Bells

The clearest difference is ads: Five Bells at none against Atomic Clock PRO's shown. Five Bells also leads on update cadence (every 2 months vs every 3 months). Atomic Clock PRO's advantage is ratings volume (10K vs 198). On price, rating, review sentiment and in-app purchases 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 Five Bells sells 3 one-off in-app purchases. 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 Five Bells. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 198, 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 79% of Five Bells's.

Atomic Clock PRO ships an update every 3 months, Five Bells every 2 months. The most recent releases landed on October 13, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | Five Bells |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews) | **[4.7 (198 ratings)](https://appshunter.io/ios/app/five-bells/id1579094984/reviews)** |
| Number of ratings | **10K** | 198 |
| Positive reviews | 72.9% of reviews | **79.5% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 6 MB | 36 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [Mark Gould](https://appshunter.io/developer/1575372263) |

## 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


### Five Bells

[App page](https://appshunter.io/ios/app/five-bells/id1579094984)

This app replicates the traditional ship's bell system for marking time and watch changes. Users can configure bell sequences, set hourly chimes, and schedule quiet times. It also offers additional information for sailors.

**Highlights:** Traditional ship's bell simulation, Configurable bell sequences, Hourly single bell option, Scheduled quiet time, Maritime information for sailors

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Regular Coffee | $1.99 | one-time |
| Large Coffee | $2.99 | one-time |
| Lunch | $4.99 | one-time |

**What reviewers like**

- 🔔 Great bell sounds
- 👍 Exactly what users wanted
- 💡 Useful for time tracking
- 💰 Free with donation option
- 🌙 Quiet hours feature appreciated

**What reviewers complain about**

- 🐛 Quiet time feature doesn't work
- ⏰ Time incorrect/chiming late
- 🔇 Silence function doesn't work
- 🔊 Too loud, needs volume control
- 🔔 Half-hour bell can be annoying

**Reported bugs**

- Quiet time feature doesn't work
- Time incorrect, chiming late
- Silence function doesn't work
- App doesn't work on Apple Watch, only one ding
- Number of bells doubled on iPad compared to iPhone

**Requested features**

- Nicer clock interface
- Volume control or loud/medium/quiet switch
- Option to leave out half-hour bell
- Ability to have app on Apple Watch
- Choice of bell sounds


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is Five Bells free?

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

### Which has better reviews, Atomic Clock PRO or Five Bells?

Five Bells is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while Five Bells averages 4.7 from 198 ratings.

### Do Atomic Clock PRO or Five Bells have ads?

Atomic Clock PRO shows ads; Five Bells does not.

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

Atomic Clock PRO ships an update every 3 months, and Five Bells every 2 months. Most recently, Atomic Clock PRO was updated on October 13, 2026 and Five Bells on October 1, 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.*