# Millisecond Clock vs Alarm Clock

The clearest difference is review sentiment: Millisecond Clock at 73% against Alarm Clock's 0%. Millisecond Clock also leads on rating (4.7 vs 3.3) and ratings volume (131 vs 6). Alarm Clock's advantage is in-app purchases (none vs 3) and update cadence (every 2 days vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Millisecond Clock holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Millisecond Clock has 131 ratings behind it against 6, 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 Alarm Clock's.

Millisecond Clock ships an update every 6 months, Alarm Clock every 2 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Millisecond Clock | Alarm Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews)** | [3.3 (6 ratings)](https://appshunter.io/ios/app/alarm-clock-timer/id6443424059/reviews) |
| Number of ratings | **131** | 6 |
| Positive reviews | **72.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 4 MB | 19 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) | [Selcuk ASLANTAS](https://appshunter.io/developer/1556053491) |

## 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 |


### Alarm Clock

[App page](https://appshunter.io/ios/app/alarm-clock-timer/id6443424059)

This app helps you wake up on time with customizable alarms and sleep soundly with soothing sounds. It also includes timers for various activities like cooking or workouts, and countdowns for special events.

**Highlights:** Customizable alarm playlists, Background alarm support, Sleep timer with music/white noise, Countdown timers for events, Multifunctional cooking/exercise timer, Desk clock display

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Millisecond Clock free?

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

### Is Alarm Clock free?

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

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

Millisecond Clock is rated higher. Millisecond Clock averages 4.7 out of 5 from 131 ratings, while Alarm Clock averages 3.3 from 6 ratings.

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

Both Millisecond Clock and Alarm Clock show ads.

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

Millisecond Clock ships an update every 6 months, and Alarm Clock every 2 days. Most recently, Millisecond Clock was updated on October 1, 2026 and Alarm Clock on September 30, 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.*