# Alarm Clock' vs Atomic Clock PRO

The clearest difference is update cadence: Alarm Clock' at every 3 weeks against Atomic Clock PRO's every 4 months. Alarm Clock' also leads on ratings volume (36K vs 10K). Atomic Clock PRO's advantage is review sentiment (73% vs 64%) and iOS requirement (15.6 vs 18.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Alarm Clock' sells 5 in-app purchases, starting at $4.99 per 7 days and Atomic Clock PRO sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Alarm Clock' against 4.7 for Atomic Clock PRO. Both are backed by a comparable volume of ratings — 36K and 10K respectively. Written reviews are what separate them: 64% of Alarm Clock''s written reviews are positive against 73% of Atomic Clock PRO's.

Alarm Clock' ships an update every 3 weeks, Atomic Clock PRO every 4 months. Both last shipped on November 10, 2026.

## The numbers

| Metric | Alarm Clock' | Atomic Clock PRO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (36K ratings)](https://appshunter.io/ios/app/alarm-clock/id406141511/reviews) | **[4.7 (10K ratings)](https://appshunter.io/ios/app/atomic-clock-pro/id899090224/reviews)** |
| Number of ratings | **36K** | 10K |
| Positive reviews | 64.1% of reviews | **72.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 259 MB | 6 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Impala Studios B.V.](https://appshunter.io/developer/1063279743) | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) |

## What reviewers say

### Alarm Clock'

[App page](https://appshunter.io/ios/app/alarm-clock/id406141511)

Wake up with customizable alarms, music, and sounds. Features include a sleep timer, adjustable nightstand display, and an instant flashlight. Enjoy a premium ad-free experience with a subscription.

**Highlights:** Unlimited alarms with music or sounds, Customizable nightstand display colors, Large snooze buttons, Sleep timer for music playlists, Local weather information, Instant flashlight via shake gesture

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $4.99 | per 7 days |
| Premium Yearly Promo | $17.49 | per year |
| Premium Yearly | $34.99 | per year |
| Premium Yearly | $34.99 | per year |
| Upgrade to full version | $34.99 | one-time |

**What reviewers like**

- 🚀 Best alarm app ever
- 👍 Customizable alarms and music
- 🔒 Reliable and consistent
- 💡 Useful features like flashlight

**What reviewers complain about**

- 🐛 Alarm not going off
- 🔋 Battery drain issues
- 📢 Intrusive and bright ads
- 🔒 Unreliable alarm function

**Reported bugs**

- Alarm freezing or crashing
- Clock display disappearing
- Snooze button not working
- Compatibility issues with iOS updates

**Requested features**

- More alarm sound options
- Ability to upload own music
- Persistent clock display at night
- Exclude from Screen Time


### Atomic Clock PRO

[App page](https://appshunter.io/ios/app/atomic-clock-pro/id899090224)

This app provides highly accurate time by syncing with official atomic clock servers. Customize your display with digital or analog views, personal backgrounds, and adjustable sizes. It's perfect for precise timekeeping, travel, or as a personalized desk clock.

**Highlights:** Atomic clock time synchronization, Digital and analog display options, Customizable backgrounds, Adjustable clock size, Automatic time zone recognition, Screen always on option

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


## Frequently asked questions

### Is Alarm Clock' free?

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

### Is Atomic Clock PRO free?

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

### Which has better reviews, Alarm Clock' or Atomic Clock PRO?

Atomic Clock PRO is rated higher. Alarm Clock' averages 4.6 out of 5 from 36K ratings, while Atomic Clock PRO averages 4.7 from 10K ratings.

### Do Alarm Clock' or Atomic Clock PRO have ads?

Both Alarm Clock' and Atomic Clock PRO show ads.

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

Alarm Clock' ships an update every 3 weeks, and Atomic Clock PRO every 4 months. Most recently, Alarm Clock' was updated on November 10, 2026 and Atomic Clock PRO on November 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.*