# ecoClock vs Millisecond Clock

The clearest difference is rating: Millisecond Clock at 4.7 against ecoClock's 4.0. Millisecond Clock also leads on ratings volume (131 vs 1) and review sentiment (73% vs 56%). ecoClock's advantage is iOS requirement (8.0 vs 15.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. ecoClock sells 3 one-off in-app purchases and Millisecond Clock sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Millisecond Clock holds the better App Store score, 4.7 against 4.0. 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: 56% of ecoClock's written reviews are positive against 73% of Millisecond Clock's.

ecoClock ships an update every 3 months, Millisecond Clock every 6 months. The most recent releases landed on September 24, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | ecoClock | Millisecond Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/ecoclock/id499209431/reviews) | **[4.7 (131 ratings)](https://appshunter.io/ios/app/millisecond-clock/id1526615560/reviews)** |
| Number of ratings | 1 | **131** |
| Positive reviews | 56.3% of reviews | **72.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 29 MB | 4 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Atsuhiko Tanaka](https://appshunter.io/developer/490968621) | [Chia-Chun Hsieh](https://appshunter.io/developer/908221958) |

## What reviewers say

### ecoClock

[App page](https://appshunter.io/ios/app/ecoclock/id499209431)

This app offers a suite of essential tools for daily life, including world clocks, alarms, timers, and a stopwatch. It also provides simple utilities like a compass, spirit level, and calculator, with customizable wallpaper options.

**Highlights:** World date and clock display, Customizable alarms and timers, Stopwatch with 1/100 sec precision, Simple utility tools (compass, spirit level, calculator), Adjustable screen brightness timer, Customizable wallpaper, Battery status display

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iPhone version | $5.99 | one-time |
| iPad version | $8.99 | one-time |
| Full version | $11.99 | one-time |


### 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 |


## Frequently asked questions

### Is ecoClock free?

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

### Is Millisecond Clock free?

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

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

Millisecond Clock is rated higher. ecoClock averages 4.0 out of 5 from 1 ratings, while Millisecond Clock averages 4.7 from 131 ratings.

### Do ecoClock or Millisecond Clock have ads?

Both ecoClock and Millisecond Clock show ads.

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

ecoClock ships an update every 3 months, and Millisecond Clock every 6 months. Most recently, ecoClock was updated on September 24, 2026 and Millisecond Clock on October 1, 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.*