Reflex vs ReflexTest vs RTap: Which Reaction App Fits You?

Three Android apps promise to test your reactions, and all three sit one search away from each other: Reflex by Kranus Company, ReflexTest by Daniel Hiebeler, and RTap. They are not versions of the same thing. They are separate apps from separate developers that happen to hunt the same keyword. Here is how they differ, and which one fits you.

The short answer

Pick Reflex if you want full brain training — reaction plus memory plus concentration games, with tracked scores over time. Pick ReflexTest if you want one clean timer, no ads, no fuss, and nothing collected from you. Pick RTap if you mostly want to race a friend, because its 2-player reaction games are its reason to exist.

Reflex by Kranus Company

Reflex (package brain.reaction.concentration, version 14.9, about 24.6 MB, free, 45+ languages) is the most complete package of the three. The core wait-and-tap test is there, but it sits inside a wider set of games that train memory and concentration alongside raw speed. Your scores accumulate, so you can watch your average reaction time trend across days and weeks.

That breadth is its strength and its trade-off. If all you want is a single number, Reflex gives you menus to walk through first. If you want a daily training habit, the variety keeps five minutes from going stale. Our walkthrough of the Reflex app, its games and scores covers what each mode measures.

ReflexTest by Daniel Hiebeler

ReflexTest does one job: it times your reaction. Wait for the cue, tap, read your milliseconds. That is the whole app, and for many people that is exactly right. It carries no ads and collects no data, which makes it the privacy pick of this group by a wide margin.

The flip side is depth. There are no memory games, no training programs, no long-term tracking features to speak of. ReflexTest tells you how fast you are right now; it does not coach you to get faster. Pair it with a notebook — or with the logging habit in our reaction time training routine — if you want progress records.

RTap

RTap is the social one. Its reaction games include a 2-player mode where two people share one screen and race for the tap, which turns a solitary measurement into a contest. Solo testers get a perfectly serviceable set of reaction games too, but the head-to-head mode is why RTap exists and why groups of friends keep it installed.

As a measurement tool it sits between the other two: more playful than ReflexTest, less of a training system than Reflex. If your goal is a personal best tracked over a month, RTap's game-first design gives you less structure. If your goal is beating your brother at the dinner table, nothing else here comes close.

Head to head

Best for	Reflex: daily training	ReflexTest: pure timing	RTap: playing with friends
Memory / focus games	Yes	No	Limited
Ads / data	Standard free app	No ads, no data collected	Standard free app
2-player mode	No	No	Yes
Score tracking	Built in	Minimal	Basic

A note on comparing scores between apps

Do not line up a Reflex score against a ReflexTest score and declare a winner. Each app renders its cue differently, polls your tap on its own timing, and sits on top of your phone's touch delay, which varies by device. A 240 ms in one app can honestly equal a 225 ms in another. Scores only compete fairly inside the same app, on the same phone.

The benchmarks still help you read any of them: about 250 milliseconds is the average adult response to a visual cue, around 170 milliseconds for sound, and roughly 150 milliseconds is the human floor. Whichever app you choose, judge yourself against those numbers and against your own first week — not against a screenshot from a different app on a different phone.

How to choose

Be honest about what you will actually open tomorrow. A training app only works if you use it, and the best tracker on paper loses to the simple timer you enjoy. Want structure and variety? Reflex, from the official listing on our Reflex download page. Want the number and nothing else? ReflexTest. Want a game night weapon? RTap.

One last caution: whatever you pick, check the developer and package name on the listing before installing. The names are similar on purpose-built search results pages, and more namesakes keep appearing. And if a teacher sent you here — the school program is ExploreLearning Reflex, a math-facts tool, and none of these three apps will do your homework.