osu! Reaction Time Test

Measure your milliseconds and find out which Approach Rate you can truly read

Reaction time is the gap between a stimulus appearing on screen and your finger completing the click. In osu! that number has a very specific meaning: it sets the minimum window you need to answer a circle you did not see coming. The Human Benchmark median for click-based reaction tests is around 273 ms, and that figure is the anchor for understanding why a high Approach Rate feels impossible at first and perfectly comfortable a few months later.

This test measures pure visual reaction: you wait for the colour to change and you click. That is a clean measurement, but it is not the whole picture. osu! performance depends far more on reading, meaning how fast you process patterns already visible on screen and anticipate where the cursor needs to go. Run several sets of five to ten attempts, keep your median rather than your best single click, and then use the tables below to translate that number into concrete Approach Rates.

Approach Rate and Preempt Time in osu!

Approach Rate defines how many milliseconds before the hit moment a circle appears on screen. That window is called preempt, and it is the total time budget you have to see the object, process it, move the cursor and click. Compare your measured reaction time against this table to see how much real margin each AR leaves you.

Approach Rate	Appearance time (preempt)	What it demands from the player
AR8	≈ 750 ms	Generous margin: roughly 475 ms left over the Human Benchmark median (~273 ms), so dense patterns can be read calmly. A common AR on intermediate maps.
AR9	≈ 600 ms	About 325 ms of cushion over the median: enough to react, but you should already be anticipating jumps rather than answering each note individually.
AR10	≈ 450 ms	Every AR step above 5 removes 150 ms, so AR10 leaves only about 175 ms of margin. It is the editor maximum, and HardRock also lands here on any map from roughly AR7.2 upwards (AR × 1.4, capped at 10).
AR10.33 (DoubleTime on AR9)	≈ 400 ms	DoubleTime plays the map 1.5× faster, so AR9's 600 ms becomes 400 ms. Around 125 ms of margin over the median: trained reading starts to matter more than reflexes.
AR11 (DoubleTime on AR10)	≈ 300 ms	450 ms ÷ 1.5 = 300 ms, barely 25–30 ms above the Human Benchmark median. At this point you are not reacting to each note: you are reading ahead and anticipating the rhythm.

Preempt formula: from AR5 upwards, 1200 − 150 × (AR − 5) ms; below AR5, 1200 + 120 × (5 − AR) ms (AR5 = 1200 ms, AR0 = 1800 ms). DoubleTime divides the real preempt by 1.5, and HardRock multiplies AR by 1.4 with a cap of 10 (it also flips the map vertically). Margins are calculated against the Human Benchmark median (~273 ms) and are indicative: your own margin depends on your measured reaction.

Reaction Time Percentiles

These bands use Human Benchmark statistics as the reference (median ~273 ms on click-based tests). Each note compares the band with osu! preempt times.

Range	Level	What it means
< 150 ms	Likely anticipation	An average this low on a visual click test most likely means you clicked before processing the stimulus (guessing). A genuine, repeated clean average here would be exceptional. Repeat the set and trust your median.
150–200 ms	Excellent	Clearly faster than the Human Benchmark median; the band where competitive and top players usually sit (no official data). Even at AR10 (450 ms) you keep a comfortable margin to answer surprise notes.
200–250 ms	Good	Above average. AR9 (600 ms) leaves plenty of room, and AR10 is workable once your reading is trained.
250–300 ms	Average	The band containing the Human Benchmark median (~273 ms). At AR10 you keep roughly 150–200 ms of margin, so trained reading matters more than raw reflexes.
> 300 ms	Below average	Below average; often fatigue, a cold start or hardware latency (60 Hz display, browser, wireless mouse). Check your setup before drawing conclusions.

Reaction and Reading Are Not the Same Thing

Reaction time measures your response to something unpredictable: you do not know when it will happen, so the clock starts the moment the stimulus appears. Reading is different. It means processing information already on screen. When you see five circles with their combo numbers and approach circles, you are not reacting to each one: you are building a movement plan for the next couple of seconds and executing it.

That is why top players do not necessarily have extraordinary reaction times. What they have is a huge visual vocabulary: they recognise a star pattern, a zigzag stream or a triangular jump in a fraction of the time a newcomer needs, because they have seen that shape thousands of times. Pure reaction only dominates in two cases: very high AR maps where preempt approaches your minimum response time, and surprise patterns such as abrupt slider velocity changes or hidden sections with the Hidden mod.

In osu!mania the balance shifts again. During fast streams at high KPS the bottleneck is not seeing the note, it is tapping speed: your fingers have to alternate at a frequency conscious reaction cannot even supervise. There you are training motor control and endurance, not milliseconds of reaction. Reaction becomes relevant again on irregular patterns, unexpected jacks and scroll speed changes.

How to Improve Your Reading and Reaction in osu!

Biological reaction time barely moves with training, but almost everything else does: reading, hardware latency and your daily condition all make a noticeable difference. These six points matter most.

Train high AR with DoubleTime. Take maps you already dominate at AR9 and push them to AR10 or AR11 with DT. You will feel lost at first, but the brain recalibrates quickly and the original AR will feel slow when you go back.
Deliberately lower the AR to force reading. Playing hard maps at AR7 or AR8 forces you to process many objects at once and plan your movement, which is exactly the skill dense patterns require.
Use a high refresh rate monitor. A 60 Hz frame lasts 16.7 ms and a 144 Hz frame 6.9 ms, so a higher refresh rate can show each object up to ~10 ms sooner and, more importantly, renders the approach circle with far better temporal resolution.
Calibrate your offset and audio latency. A badly set offset makes you tap consistently early or late and ruins accuracy even when your reading is fine. Recalibrate whenever you change headphones or output device.
Warm up before serious play. Ten to fifteen minutes on maps below your level is enough to measurably lower your reaction compared with cold first attempts.
Sleep. It is the most ignored factor and the heaviest one: losing a few hours of sleep degrades reaction and consistency far more than any settings tweak can fix.

Frequently Asked Questions

What is the average reaction time of an osu! player?

There is no official data on osu! players' reaction times. The reference is the Human Benchmark median for click tests (~273 ms). Regular players who practise with fast visual stimuli on low-latency hardware often land somewhat faster, but that is an indicative estimate, not a measurement.

Does playing osu! improve your reflexes?

It strongly improves reading, visual tracking and hand-eye coordination, and it usually shaves a little off measured reaction times. But the biological ceiling for visual reaction barely moves: what you gain is faster processing of what you see and cleaner movement execution, not new neural speed.

Which Approach Rate demands the most reaction?

The higher the AR, the shorter the preempt and the more pure reaction matters. AR11 with DoubleTime, at roughly 300 ms of appearance time, is the extreme case. Interestingly, very low ARs are also hard, but through visual saturation: too many objects on screen turn it into a reading problem rather than a reaction one.

How many milliseconds of preempt does AR11 have?

AR11 has a preempt of 300 ms: AR10's 450 ms divided by 1.5 when DoubleTime is applied. That is the only way to reach it, since the editor does not allow values above AR10 and HardRock caps at 10. The window sits only about 30 ms above the Human Benchmark median (~273 ms), so at that level you play by reading ahead and anticipating the rhythm rather than reacting to each circle.

How do I improve reading in osu!?

By deliberately alternating extremes. High-AR sessions with DoubleTime to get used to deciding fast, and low-AR sessions on dense maps to train processing many simultaneous objects. Add variety of mappers so you do not simply memorise specific patterns, and review replays of your misses to identify which shapes throw you off.