# Millisecond Clock vs Round Millisecond Clock

The clearest difference is review sentiment: Millisecond Clock at 73% against Round Millisecond Clock's 0%. Millisecond Clock also leads on rating (4.7 vs 1.0) and ratings volume (131 vs 1). Round Millisecond Clock's advantage is in-app purchases (none vs 3) and iOS requirement (13.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Millisecond Clock sells 3 one-off in-app purchases. Round Millisecond Clock asks for nothing beyond the download.

Millisecond Clock holds the better App Store score, 4.7 against 1.0. That said, the two scores are not equally well evidenced: Millisecond Clock has 131 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 73% of Millisecond Clock's written reviews are positive against 0% of Round Millisecond Clock's.

Millisecond Clock ships an update every 6 months, Round Millisecond Clock every 4 months. The most recent releases landed on October 1, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Millisecond Clock | Round Millisecond Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/round-millisecond-clock/id6736579896/reviews) |
| Number of ratings | **131** | 1 |
| Positive reviews | **72.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 4 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 4 MB | 34 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) | [Seulki Eom](https://appshunter.io/developer/1718927408) |

## What reviewers say

### Millisecond Clock

[App page](https://appshunter.io/ios/app/millisecond-clock/id1526615560)

This app displays the most accurate time available, down to the millisecond. It's useful for measuring network delays or video streaming lag by comparing displayed time differences.

**Highlights:** Millisecond precision time display, Accurate timekeeping for iPhone and iPad, Network delay measurement, Video streaming lag analysis, Free to download

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Special Offer Package | $2.99 | one-time |
| Unlock Themes | $3.99 | one-time |


### 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


## Frequently asked questions

### Is Millisecond Clock free?

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

### Is Round Millisecond Clock free?

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

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

Millisecond Clock is rated higher. Millisecond Clock averages 4.7 out of 5 from 131 ratings, while Round Millisecond Clock averages 1.0 from 1 ratings.

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

Both Millisecond Clock and Round Millisecond Clock show ads.

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

Millisecond Clock ships an update every 6 months, and Round Millisecond Clock every 4 months. Most recently, Millisecond Clock was updated on October 1, 2026 and Round Millisecond Clock on September 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*