# Micro Clock vs Underwater Stopwatch

The clearest difference is in-app purchases: Underwater Stopwatch at none against Micro Clock's 1. Underwater Stopwatch also leads on update cadence (every 3 days vs every 9 days). Micro Clock's advantage is iOS requirement (15.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Micro Clock sells 1 one-off in-app purchase. Underwater Stopwatch asks for nothing beyond the download.

Micro Clock ships an update every 9 days, Underwater Stopwatch every 3 days. Both last shipped on October 8, 2026.

## The numbers

| Metric | Micro Clock | Underwater Stopwatch |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Size | 6 MB | 4 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [俊贤 黄](https://appshunter.io/developer/1889807845) | [Vlad Topala](https://appshunter.io/developer/6783263834) |

## What reviewers say

### Micro Clock

[App page](https://appshunter.io/ios/app/micro-clock-floating-timer/id6762129008)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Micro Clock Pro Lifetime | $9.99 | one-time |


### Underwater Stopwatch

[App page](https://appshunter.io/ios/app/underwater-stopwatch/id6783263832)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Micro Clock free?

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

### Is Underwater Stopwatch free?

Underwater Stopwatch is free to download, with no in-app purchases.

### Do Micro Clock or Underwater Stopwatch have ads?

Neither Micro Clock nor Underwater Stopwatch shows ads.

### Which is updated more often, Micro Clock or Underwater Stopwatch?

Micro Clock ships an update every 9 days, and Underwater Stopwatch every 3 days. Most recently, Micro Clock was updated on October 8, 2026 and Underwater Stopwatch on October 8, 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.*