# MillisecondTimer vs Reaction Time Test

The clearest difference is in-app purchases: Reaction Time Test at none against MillisecondTimer's 3. Reaction Time Test also leads on ads (none vs shown) and update cadence (every 8 days vs every 3 weeks). MillisecondTimer's advantage is iOS requirement (15.6 vs 17.0). On price and device support there is nothing between them.

Both are free to download. MillisecondTimer sells 3 in-app purchases, starting at $1.00 per month. Reaction Time Test asks for nothing beyond the download.

MillisecondTimer ships an update every 3 weeks, Reaction Time Test every 8 days. The most recent releases landed on November 3, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | MillisecondTimer | Reaction Time Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/millisecondtimer/id6462732415/reviews)** | — |
| Number of ratings | **10** | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | **Every 8 days** |
| Monetization | Free with in-app purchases | — |
| Size | 30 MB | 5 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [WONJI HA](https://appshunter.io/developer/1703308182) | [Jinwan Kim](https://appshunter.io/developer/1446513824) |

## What reviewers say

### MillisecondTimer

[App page](https://appshunter.io/ios/app/millisecondtimer/id6462732415)

This app provides highly accurate timing tools, including a countdown timer, stopwatch, and clock, all with millisecond precision. It's designed for precise measurements in workouts, games, and everyday situations, offering background operation and seamless switching between apps.

**Highlights:** Millisecond precision timing, Countdown timer with custom intervals, Stopwatch for accurate interval recording, Real-time millisecond clock display, Background operation and notifications, Recent timers for quick reuse, Customizable 12/24 hour clock format

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MillisecondTimer Pro Month Plan | $1.00 | per month |
| MillisecondTimer Pro Annual Plan | $5.99 | per year |
| MillisecondTimer Pro Lifetime | $34.99 | one-time |


### Reaction Time Test

[App page](https://appshunter.io/ios/app/reaction-time-test-millis/id6805464656)

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

**In-app purchases:** none


## Frequently asked questions

### Is MillisecondTimer free?

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

### Is Reaction Time Test free?

Reaction Time Test is free to download, with no in-app purchases.

### Do MillisecondTimer or Reaction Time Test have ads?

MillisecondTimer shows ads; Reaction Time Test does not.

### Which is updated more often, MillisecondTimer or Reaction Time Test?

MillisecondTimer ships an update every 3 weeks, and Reaction Time Test every 8 days. Most recently, MillisecondTimer was updated on November 3, 2026 and Reaction Time Test on November 6, 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.*