# ReactionTimeChecker vs BiDot

The clearest difference is review sentiment: BiDot at 84% against ReactionTimeChecker's 33%. BiDot also leads on rating (4.4 vs 1.0) and ratings volume (9 vs 1). ReactionTimeChecker's advantage is in-app purchases (none vs 10). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BiDot sells 10 in-app purchases, starting at $2.79 per month. ReactionTimeChecker asks for nothing beyond the download.

BiDot holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: BiDot has 9 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 33% of ReactionTimeChecker's written reviews are positive against 84% of BiDot's.

ReactionTimeChecker ships an update every 7 months, BiDot every 9 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | ReactionTimeChecker | BiDot |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/reactiontimechecker/id537191082/reviews) | **[4.4 (9 ratings)](https://appshunter.io/ios/app/bidot/id900411937/reviews)** |
| Number of ratings | 1 | **9** |
| Positive reviews | 33.3% of reviews | **84.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 7 months** | Every 9 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 22 MB | 63 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [NSC, K.K.](https://appshunter.io/developer/501890400) | [SH Limited](https://appshunter.io/developer/960275282) |

## 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


### BiDot

[App page](https://appshunter.io/ios/app/bidot/id900411937)

A challenging puzzle game where you must separate colored dots by controlling a sliding door. It's easy to learn but difficult to master, offering endless fun with two distinct game modes.

**Highlights:** Separate colored dots, Sliding door mechanic, Two game modes (BiDot, Zen), Easy to learn, hard to master, Constant motion challenges

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium User 1 Month 30% OFF | $2.79 | per month |
| 1 Week premium user | $7.99 | per 7 days |
| 1 Week Premium User free trial | $7.99 | per 7 days |
| 1 Month premium user 0.99 1/mo | $9.99 | per month |
| Premium User 3 Months | $11.99 | per 3 months |
| Premium User 1 Year 30% OFF | $24.49 | per year |
| Premium User 1 Year | $34.99 | per year |
| Premium Pass 1 Month 30% OFF | $3.49 | one-time |
| Premium Pass 1 Month | $4.99 | one-time |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is ReactionTimeChecker free?

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

### Is BiDot free?

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

### Which has better reviews, ReactionTimeChecker or BiDot?

BiDot is rated higher. ReactionTimeChecker averages 1.0 out of 5 from 1 ratings, while BiDot averages 4.4 from 9 ratings.

### Do ReactionTimeChecker or BiDot have ads?

Both ReactionTimeChecker and BiDot show ads.

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

ReactionTimeChecker ships an update every 7 months, and BiDot every 9 months. Most recently, ReactionTimeChecker was updated on November 1, 2026 and BiDot on November 1, 2026.

---

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