// LOADING OSUMAUK
Approach Rate decides how much time you get to read a note. Here is what AR8, AR9, AR10 and the DT-inflated AR11 actually feel like, how much reaction time each gives you, and how to train up the chart.
By OSUMAUK Staff
Approach Rate is the difficulty setting most beginners underestimate. It controls how long a note is visible before you have to hit it - nothing more, nothing less. Two maps at the same star rating can feel completely different because one is AR8 and the other is AR10. Learning to read the AR ladder is one of the biggest single jumps you can make in osu!standard, and it is almost entirely trainable.
AR sets the "preempt" - the number of milliseconds a note stays on screen as the approach circle shrinks. Lower AR means the note appears earlier and lingers, so the screen fills with more circles at once but each one gives you plenty of time. Higher AR means notes appear later and you have to react faster, but the playfield stays cleaner. That trade-off, density versus reaction speed, is the whole story.
A common mistake is calling low AR "easy". Low AR is a reading test of a different kind - the screen is crowded, notes overlap, and you have to parse a busy playfield. High AR is a reaction test. They fail you in opposite ways.
These are the approximate preempt times (how long a note is visible) for each AR. Exact values come from the osu! difficulty formula; treat these as the practical feel rather than frame-perfect numbers.
| AR | Approx. note visible for | How it feels | Where you meet it |
|---|---|---|---|
| AR8 | ~600 ms | Comfortable reading, screen a little busy | Most 3-4 star Insanes |
| AR9 | ~450 ms | The standard "fast" read; needs real reaction | Typical 4-5 star Insanes/Extras |
| AR9.5 | ~400 ms | Sharp - late reads start dropping combos | Harder Extras, HR on AR8 maps |
| AR10 | ~300 ms | Twitch reaction; no time to hesitate | 6+ star maps, HR on AR9 |
| AR10.3 | ~267 ms | Elite reaction speed | HR stacked on already-high AR |
| AR11 | ~230 ms | DT-inflated; the classic HDDT wall | DT applied to AR9 maps |
You will never pick "AR11" from a slider - it comes from mods. Double Time speeds the map up, which raises the effective AR of whatever you were playing. An AR9 map under DT reads at roughly AR10.3, and an AR9.6 map under DT lands near AR11. This is why the jump from nomod to HDDT feels brutal: you are not just clicking faster, you are reading notes that appear and vanish in a fraction of the time. Hard Rock raises AR too, capping at AR10, which is why HR on an AR8 map suddenly feels like a different map.
If HDDT feels impossible, it is almost always the reading, not the aim. Practise the AR before the speed: play maps at the AR11-equivalent range nomod, or use DT on lower-AR maps, before stacking Hidden on top.
AR reading is a skill that builds fast if you stress it deliberately. The worst thing you can do is stay at your comfortable AR forever and expect high AR to arrive on its own.
A clean reference for the top of the ladder is a map like FREEDOM DiVE, whose hardest diff sits at AR10 and rewards the exact reaction speed this chart is about. Read it nomod first, then understand that stacking DT is what pushes real maps into the AR11 range.
// Beatmap
xi - FREEDOM DiVE
FOUR DIMENSIONS sits at 7.42★, AR10 - a clean high-AR reaction benchmark
AR sits alongside OD, CS and HP as the four settings that shape how a map feels - the star-rating-and-difficulty guide covers the rest. And because AR is central to the HDDT stack, the mods guide is worth reading right after this one.