# Flip Clock Pro vs AtomicClock

The clearest difference is price: AtomicClock at Free against Flip Clock Pro's $2.99. AtomicClock also leads on update cadence (every 3 weeks vs every 2 months) and rating (4.8 vs 4.6). Flip Clock Pro's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

AtomicClock is free to download; Flip Clock Pro costs $2.99 up front. AtomicClock sells 1 one-off in-app purchase. Flip Clock Pro asks for nothing beyond the download.

AtomicClock holds the better App Store score, 4.8 against 4.6. Both are backed by a comparable volume of ratings — 1.5K and 5.5K respectively. Written reviews point the same way: 74% of Flip Clock Pro's written reviews are positive against 85% of AtomicClock's.

Flip Clock Pro ships an update every 2 months, AtomicClock every 3 weeks. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Flip Clock Pro | AtomicClock |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.6 (1.5K ratings)](https://appshunter.io/ios/app/flip-clock-pro-time-widgets/id1181029289/reviews) | **[4.8 (5.5K ratings)](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049/reviews)** |
| Number of ratings | 1.5K | **5.5K** |
| Positive reviews | 74.1% of reviews | **84.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 46 MB | 17 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [翠玲 施](https://appshunter.io/developer/1181028776) | [Timo Partl](https://appshunter.io/developer/1387413672) |

## What reviewers say

### Flip Clock Pro

[App page](https://appshunter.io/ios/app/flip-clock-pro-time-widgets/id1181029289)

A minimalist desktop digital clock offering a variety of customization options. It displays time with seconds, includes a smart alarm, timer, stopwatch, and Pomodoro timer. The app also supports white noise and personalized signatures.

**Highlights:** Display time with seconds, Smart alarm clock, Timer and stopwatch, Pomodoro Technique timer, Multiple clock themes, Background white noise playback, Home and lock screen widgets

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great app with lots of customization options
- 👍 Useful features like alarm clock and vertical flip clock
- 👍 Simple and clean interface
- 👍 Visible from a distance
- 👍 Nostalgic retro style

**What reviewers complain about**

- 🐛 Occasional crashes and bugs
- 🐛 Inconsistent sound and alarm issues
- 🐛 Seconds digit freezing up
- 🐛 Widget not respecting app settings
- 🔋 Brightness issues and screen burn-in concerns

**Reported bugs**

- Seconds digit freezing
- Widget not showing 12-hour time format
- Brightness issues when leaving app open
- Inconsistent sound and alarm problems

**Requested features**

- Add more alarm sound options
- Allow customization of alarm sound from music library
- Implement a snooze function
- Add ability to set multiple alarm times
- Provide more color and font customization options


### AtomicClock

[App page](https://appshunter.io/ios/app/atomicclock-ntp-time/id1402993049)

This app displays the exact current time synchronized with NTP servers, offering a customizable clock view for precise time checks. It's ideal for setting watches, verifying timestamps, or comparing local and network time.

**Highlights:** Precise time from NTP servers, Customizable clock faces, Select or add time servers, Local and UTC views, 12/24 hour modes, Customizable time format, Acoustic ticking

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro Version | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate time
- 👍 Highly customizable
- 🚀 Precise to the second
- 👍 Easy to use
- 👍 Helpful for setting watches

**What reviewers complain about**

- 🐛 Server connection issues
- 🔍 Limited time zone options
- 💰 Ads diminish clock view
- 🔍 Lacks some advanced features
- 🔍 Redundant for some users

**Reported bugs**

- Crashes on certain iOS versions
- Occasional freezing of hands
- Countdown timer sound not working

**Requested features**

- Add GMT/dual time display
- Implement widget support
- Add different second hand sounds
- Allow setting background color to match watch
- Include alarm/timer functionality


## Frequently asked questions

### Is Flip Clock Pro free?

Flip Clock Pro costs $2.99, with no in-app purchases.

### Is AtomicClock free?

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

### Which has better reviews, Flip Clock Pro or AtomicClock?

AtomicClock is rated higher. Flip Clock Pro averages 4.6 out of 5 from 1.5K ratings, while AtomicClock averages 4.8 from 5.5K ratings.

### Do Flip Clock Pro or AtomicClock have ads?

AtomicClock shows ads; Flip Clock Pro does not.

### Which is updated more often, Flip Clock Pro or AtomicClock?

Flip Clock Pro ships an update every 2 months, and AtomicClock every 3 weeks. Most recently, Flip Clock Pro was updated on September 22, 2026 and AtomicClock on September 24, 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.*