# Millisecond Clock vs Top Clock

The clearest difference is in-app purchases: Top Clock at none against Millisecond Clock's 3. Top Clock also leads on update cadence (every 2 months vs every 6 months). Millisecond Clock's advantage is review sentiment (73% vs 61%). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.7 for Millisecond Clock against 4.6 for Top Clock. Both are backed by a comparable volume of ratings — 131 and 149 respectively. Written reviews are what separate them: 73% of Millisecond Clock's written reviews are positive against 61% of Top Clock's.

Millisecond Clock ships an update every 6 months, Top Clock every 2 months. Both last shipped on October 14, 2026.

## The numbers

| Metric | Millisecond Clock | Top Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews)** | [4.6 (149 ratings)](https://appshunter.io/ios/app/top-clock-floating-clock/id1576662803/reviews) |
| Number of ratings | 131 | **149** |
| Positive reviews | **72.7% of reviews** | 61.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 4 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) | [Shenzhen Gude Aipu Technology Co., Ltd](https://appshunter.io/developer/1896411340) |

## 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 |


### Top Clock

[App page](https://appshunter.io/ios/app/top-clock-floating-clock/id1576662803)

This app provides a floating clock and timer that stays visible above all other applications. It's useful for tasks like online shopping, studying with Pomodoro timers, or cooking with real-time countdowns.

**Highlights:** Floating clock and timer, Millisecond timing, Picture-in-picture window, Adjustable size and position, Multiple timer types (stopwatch, countdown, Pomodoro), Customizable colors, One-click operation

**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 Top Clock free?

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

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

Millisecond Clock is rated higher. Millisecond Clock averages 4.7 out of 5 from 131 ratings, while Top Clock averages 4.6 from 149 ratings.

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

Both Millisecond Clock and Top Clock show ads.

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

Millisecond Clock ships an update every 6 months, and Top Clock every 2 months. Most recently, Millisecond Clock was updated on October 14, 2026 and Top Clock on October 14, 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.*