Comparison

ReactionTimeChecker vs BiDot

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

ReactionTimeChecker

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
Read full description

[What is this game?] -This game can test your earliness of a reaction(reflexes). [How to Play] -First,You can see 25 buttons(5*5). -When a game starts,any one of the 25 buttons color will change to PINK. -You TAP the glowing pink button as soon as possible! -After the game ended, you can see your SCORE and EVALUATION(Japanese KANJI). [Online Ranking] This app will automatically upload your play results to the online ranking server. If you do not agree to the automatic registration on the online ranking server, please refrain from using this app. The data uploaded to the server is as follows. 1. The name entered on the title screen (If you do not enter the name, it will be automatically registered with the name "unknown".) 2. Play result (average reaction time) In addition, please check the following privacy policy. https://www.nscnet.jp/privacyPolicy.html *If you are using iOS 14.5 or later, a dialog asking for tracking permission will be displayed at the first startup. This setting can be confirmed and changed in the "Settings" app, "Privacy", and "Tracking". Production: NSC, K.K. If you have any problems or requests, please check the contents of the “Contact Us” page on our website and send us an e-mail. Click here for “Contact Us”: https://www.nscnet.jp/inquiry.html

About

BiDot

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
Read full description

Separate dots of different colors moving the sliding door in the center of the screen. It is not as easy as it sounds, because colored dots are in constant motion. BiDot is easy to learn, hard to master, and always fun to play. 2 game modes: BiDot and Zen Play BiDot by Spooky House Studios now! Note: The Free version may be subject to limitations and the limitations are subject to change. Our standard subscription options are: 1-month Subscription 3-months Subscription 1 Year Subscription * Subscription payments will be charged to your iTunes account at confirmation of your purchase and upon commencement of each renewal term. Subscription with a free trial period will automatically renew to a paid subscription. You can cancel your subscription or free trial in the iTunes settings at least 24-hours before the end of the free trial period. The cancellation will take effect the day after the last day of the current subscription period and you will be downgraded to the free service. * Please note: any unused portion of a free trial period (if offered) will be forfeited when you purchase a premium subscription during the free trial period. Privacy Policy: http://www.spookyhousestudios.com/privacy_policy/sh_limited.html Terms of use: http://www.spookyhousestudios.com/legal/sh_limited_subscriptions_terms_of_use.html

Screenshots

ReactionTimeChecker4 screens
BiDot4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 4 level
ReactionTimeChecker versus BiDot: the parameters behind the verdict, then further details
ParameterReactionTimeCheckerBiDot
PriceFreeFree
Rating1.0 (1 ratings)4.4 (9 ratings) — better
Positive reviews33.3% of reviews84.2% of reviews — better
Number of ratings19 — better
Update frequencyEvery 7 months — betterEvery 9 months
AdsYesYes
In-app purchasesNo — betterYes
MonetizationAd-supported — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size22 MB63 MB
Age rating4+4+
DeveloperNSC, K.K.SH Limited

Customer experience

ReactionTimeChecker

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

BiDot

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews19 reviews
Positive84.2%
Neutral5.3%
Negative10.5%

In-app purchases

None

ReactionTimeChecker

No in-app purchases

10 purchases

BiDot

Subscriptions7
  • Premium User 1 Month 30% OFF$2.791 Month
  • 1 Week premium user$7.997 Days
  • 1 Week Premium User free trial3 Days trial$7.997 Days
Show 4 more
  • 1 Month premium user 0.99 1/mo1 Month trial$9.991 Month
  • Premium User 3 Months$11.993 Months
  • Premium User 1 Year 30% OFF$24.491 Year
  • Premium User 1 Year$34.991 Year
One-time3
  • Premium Pass 1 Month 30% OFF$3.49
  • Premium Pass 1 Month$4.99
  • Remove Ads$4.99

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.

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