Comparison

ReactionTimeChecker vs Fast Reflex

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

Fast Reflex

This game challenges your reaction speed and hand-eye coordination with precise testing down to a millionth of a second. Compete globally on leaderboards and explore unique tests to boost focus and dexterity.

Highlights
  • Precise reflex testing
  • Global leaderboards
  • Telepathy test
  • Enhances focus and dexterity
  • Simple interface
  • Quick mental exercises
Features
Read full description

Experience reflex testing at its finest, with accuracy fine-tuned to an incredible 0.000001 second. Dive into a captivating game that tests your reaction speed and lets you compete with players from around the globe. This is more than just a game; it's a comprehensive tool to enhance your reflexes and hand-eye coordination. Your objective is simple: tap the red box as quickly as you can and rise up the global leaderboard. But there's more. Test your adaptability with shifts in color and sound. As an added feature, explore your mind's untapped potential with our unique Telepathy Test. Discover how quickly your thoughts can guide your fingers into action. Whether you're killing time or waiting for the bus, this app offers a stimulating mental exercise suitable for all ages. It's designed to help you practice your memory, focus, and dexterity. If you're keen on improving your reaction time, this app is the perfect tool to enhance your perceptual skills. Take the challenge today. Key Features: • Global and Cross-Platform Leaderboard • In-depth Reflex and Telepathy Tests • Simple and Intuitive Interface • Perfect for Quick Mental Exercises Boost your brain's speed today, and if you enjoy the game, please rate us.

Screenshots

ReactionTimeChecker4 screens
Fast Reflex4 screens

Verdict

The call

The clearest difference is review sentiment: Fast Reflex at 100% against ReactionTimeChecker's 33%. Fast Reflex also leads on rating (4.5 vs 1.0) and ads (none vs shown). ReactionTimeChecker's advantage is price (Free vs $0.99) and in-app purchases (none vs 1). On 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

ReactionTimeChecker is free to download; Fast Reflex costs $0.99 up front. Fast Reflex sells 1 one-off in-app purchase. ReactionTimeChecker asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Fast Reflex holds the better App Store score, 4.5 against 1.0. That said, the two scores are not equally well evidenced: Fast Reflex has 47 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 100% of Fast Reflex's.

UpkeepUpdate frequency

ReactionTimeChecker ships an update every 7 months, Fast Reflex every 2 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

Scorecard9 real differences · 1 level
ReactionTimeChecker versus Fast Reflex: the parameters behind the verdict, then further details
ParameterReactionTimeCheckerFast Reflex
PriceFree — better$0.99
Rating1.0 (1 ratings)4.5 (47 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings147 — better
Update frequencyEvery 7 monthsEvery 2 weeks — better
AdsYesNo — better
In-app purchasesNo — betterYes
MonetizationAd-supported — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.611.0 — better
Further details — not scored
Size22 MB76 MB
Age rating4+4+
DeveloperNSC, K.K.Radoslaw Kubas

Customer experience

ReactionTimeChecker

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

Fast Reflex

All ratings47 ratings
Positive85.1%
Neutral6.4%
Negative8.5%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ReactionTimeChecker

No in-app purchases

1 purchases

Fast Reflex

One-time1
  • Remove Ads$0.99

Questions

Is ReactionTimeChecker free?
ReactionTimeChecker is free to download, with no in-app purchases.
Is Fast Reflex free?
Fast Reflex costs $0.99, and also offers in-app purchases.
Which has better reviews, ReactionTimeChecker or Fast Reflex?
Fast Reflex is rated higher. ReactionTimeChecker averages 1.0 out of 5 from 1 ratings, while Fast Reflex averages 4.5 from 47 ratings.
Do ReactionTimeChecker or Fast Reflex have ads?
ReactionTimeChecker shows ads; Fast Reflex does not.
Which is updated more often, ReactionTimeChecker or Fast Reflex?
ReactionTimeChecker ships an update every 7 months, and Fast Reflex every 2 weeks. Most recently, ReactionTimeChecker was updated on October 3, 2026 and Fast Reflex on October 9, 2026.

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