# Atomic Clock PRO vs StandBy Clock

The clearest difference is rating: Atomic Clock PRO at 4.7 against StandBy Clock's 4.0. Atomic Clock PRO also leads on ratings volume (10K vs 6) and iOS requirement (15.6 vs 17.0). StandBy Clock's advantage is update cadence (every 6 days vs every 3 months) and review sentiment (100% vs 73%). On price, ads, in-app purchases and device support 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 StandBy Clock sells 3 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Atomic Clock PRO holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Atomic Clock PRO has 10K ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 73% of Atomic Clock PRO's written reviews are positive against 100% of StandBy Clock's, so the app with the better star average is not the one people write more warmly about.

Atomic Clock PRO ships an update every 3 months, StandBy Clock every 6 days. The most recent releases landed on September 25, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | Atomic Clock PRO | StandBy Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** | [4.0 (6 ratings)](https://appshunter.io/ios/app/standby-clock-custom-widgets/id6450166379/reviews) |
| Number of ratings | **10K** | 6 |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 6 MB | 23 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) | [逸文 周](https://appshunter.io/developer/1484299344) |

## 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


### StandBy Clock

[App page](https://appshunter.io/ios/app/standby-clock-custom-widgets/id6450166379)

Transform your iPhone into a personalized bedside display with over 100 customizable widgets. Show time, calendar, battery, photos, and more. Simple to use, just choose, customize, and add to your StandBy screen.

**Highlights:** 100+ customizable widgets, Analog and digital clock options, Calendar and dual time zone display, Countdown timers for events, Photo and GIF widgets, Customizable theme colors and styles

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $1.99 | per 7 days |
| Annual Pro | $6.99 | per year |
| StandBy Clock Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is Atomic Clock PRO free?

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

### Is StandBy Clock free?

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

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

Atomic Clock PRO is rated higher. Atomic Clock PRO averages 4.7 out of 5 from 10K ratings, while StandBy Clock averages 4.0 from 6 ratings.

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

Both Atomic Clock PRO and StandBy Clock show ads.

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

Atomic Clock PRO ships an update every 3 months, and StandBy Clock every 6 days. Most recently, Atomic Clock PRO was updated on September 25, 2026 and StandBy Clock on August 12, 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.*