# ReactionTimeChecker vs UUFA

The clearest difference is ads: UUFA at none against ReactionTimeChecker's shown. UUFA also leads on update cadence (every 2 weeks vs every 7 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReactionTimeChecker ships an update every 7 months, UUFA every 2 weeks. The most recent releases landed on October 23, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | ReactionTimeChecker | UUFA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/reactiontimechecker/id537191082/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 2 weeks** |
| Monetization | Ad-supported | — |
| Size | 22 MB | 19 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [NSC, K.K.](https://appshunter.io/developer/501890400) | [Torun Birkan](https://appshunter.io/developer/1895242960) |

## What reviewers say

### ReactionTimeChecker

[App page](https://appshunter.io/ios/app/reactiontimechecker/id537191082)

Test your reflexes by tapping a color-changing button as quickly as possible. Compete with others through online leaderboards and receive an evaluation of your performance.

**Highlights:** Reaction time testing, Color-changing button gameplay, Score and evaluation display, Online ranking system, Automatic result upload

**Features:** macOS Compatibility

**In-app purchases:** none


### UUFA

[App page](https://appshunter.io/ios/app/uufa-car/id6763273775)

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

**In-app purchases:** none


## Frequently asked questions

### Is ReactionTimeChecker free?

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

### Is UUFA free?

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

### Do ReactionTimeChecker or UUFA have ads?

ReactionTimeChecker shows ads; UUFA does not.

### Which is updated more often, ReactionTimeChecker or UUFA?

ReactionTimeChecker ships an update every 7 months, and UUFA every 2 weeks. Most recently, ReactionTimeChecker was updated on October 23, 2026 and UUFA on October 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*