# Round Millisecond Clock vs 24Clock

The clearest difference is review sentiment: 24Clock at 100% against Round Millisecond Clock's 0%. 24Clock also leads on rating (5.0 vs 1.0) and update cadence (monthly vs every 4 months). Round Millisecond Clock's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 16.0). On price, ads and device support there is nothing between them.

Both are free to download. 24Clock sells 1 one-off in-app purchase. Round Millisecond Clock asks for nothing beyond the download.

24Clock holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 0% of Round Millisecond Clock's written reviews are positive against 100% of 24Clock's.

Round Millisecond Clock ships an update every 4 months, 24Clock monthly. The most recent releases landed on October 21, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Round Millisecond Clock | 24Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/round-millisecond-clock/id6736579896/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/24clock-atombox/id6740284771/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 34 MB | 29 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Seulki Eom](https://appshunter.io/developer/1718927408) | [Aox.design Co., Ltd.](https://appshunter.io/developer/1468896401) |

## What reviewers say

### Round Millisecond Clock

[App page](https://appshunter.io/ios/app/round-millisecond-clock/id6736579896)

This app offers a precise real-time digital clock with a unique circular interface, displaying both seconds and milliseconds. Customize your view with options for date, day of the week, and 12/24-hour format.

**Highlights:** Millisecond precision display, Dual circle interface for seconds and milliseconds, Customizable display (milliseconds, seconds, date, day), Multiple date formats, 12/24 hour support, Screen always on

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

**In-app purchases:** none


### 24Clock

[App page](https://appshunter.io/ios/app/24clock-atombox/id6740284771)

Experience time in its purest form with a stylish clock featuring ticking sounds and customizable ambient soundscapes. This app encourages mindfulness and finding calm in the present moment, offering a unique perspective on the passage of time.

**Highlights:** Stylish clock faces, Ticking sound effects, Ambient sound creation, Mindfulness focus, Time discovery

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 24Clock Purchase | $2.99 | one-time |


## Frequently asked questions

### Is Round Millisecond Clock free?

Round Millisecond Clock is free to download, with no in-app purchases.

### Is 24Clock free?

24Clock is free to download, with in-app purchases available.

### Which has better reviews, Round Millisecond Clock or 24Clock?

24Clock is rated higher. Round Millisecond Clock averages 1.0 out of 5 from 1 ratings, while 24Clock averages 5.0 from 3 ratings.

### Do Round Millisecond Clock or 24Clock have ads?

Both Round Millisecond Clock and 24Clock show ads.

### Which is updated more often, Round Millisecond Clock or 24Clock?

Round Millisecond Clock ships an update every 4 months, and 24Clock monthly. Most recently, Round Millisecond Clock was updated on October 21, 2026 and 24Clock on October 23, 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.*