Reaction Time .info
🎵 Rhythm Chronometry & Approach Rate | AR 8 to AR 11 Telemetry

osu! Reaction Time Test: Approach Rate (AR) Latency & Reading

Reading rapid hit circles at AR 10.3 and AR 11 tests the absolute biological limit of human eye-hand coordination. Test your reflex speed and calculate your exact visual reaction window.

osu! Single-Tap Reflex Test
Raw Visual Tapping Speed

Click or press key the instant the field turns green.

⚡ Test Key Tapping Reflex
osu! Aim & Cursor Jump Test
Spatial Circle Snapping

Snap your cursor to moving 30px targets across screen coordinates.

🎯 Test Jump Snapping Speed

osu! Approach Rate (AR) Millisecond Conversion Table

The mathematical formula for osu! Approach Rate duration ($T$ in ms):

If AR ≤ 5: Time (ms) = 1200 + (5 - AR) × 120 | If AR > 5: Time (ms) = 1200 - (AR - 5) × 150
Approach Rate (AR) Visible Preempt Time Fade-In Time Reading & Reaction Demands
AR 8.0 750 ms 500 ms Comfortable reading for 4-star beatmaps
AR 9.0 600 ms 400 ms Standard 5-star to 6-star insane maps
AR 10.0 (Standard High) 450 ms 300 ms Expert 7+ star maps & HardRock (HR) mod
AR 10.33 (DT on AR 9) 400 ms 266 ms High speed DoubleTime reading benchmark
AR 11.0 (DTHR Peak) 300 ms 200 ms Extreme reaction frontier; requires sub-160ms reflexes
FAQ

osu! Reaction Time FAQ

Common questions regarding Approach Rates, tapping speeds, and tablet latency.

How many milliseconds does each osu! Approach Rate (AR) give you to react? ▼

Approach Rate determines circle visibility duration: AR 8 = 750ms, AR 9 = 600ms, AR 10 = 450ms, AR 10.3 = 390ms, and AR 11 (with HardRock / DoubleTime) gives exactly 300ms from the moment the approach circle appears until it hits the hit circle.

Can a player read AR 11 (300ms) with pure visual reaction time? ▼

Reading AR 11 requires a combination of elite raw visual reaction (~160ms) and spatial cursor positioning (~140ms). Because 300ms is right at the boundary of complex choice-reaction latency, AR 11 players rely on predictive eye tracking and pre-attentive pattern memorization.

How does rapid trigger and optical keyboard switches help in osu!? ▼

Rapid trigger technology (such as Hall Effect Wooting / DrunkDeer keypads) eliminates fixed reset points, allowing keys to re-actuate the instant they travel upward by 0.1mm. This eliminates 15ms to 30ms of key release debounce latency during high BPM streams (240+ BPM).

What tablet polling rate is best for osu! reflex accuracy? ▼

Drawing tablets with custom OpenTabletDriver running at 1000Hz (1ms report rate) with hardware smoothing filters disabled provide zero-delay cursor tracking, eliminating standard 15ms OEM driver lag.

How can I improve my high AR reading speed in osu!? ▼

Gradually scale up AR using difficulty modifiers (e.g. practicing AR 9.5 → 9.8 → 10.0), train visual reflexes on our simple and aim test modes, and use high refresh rate displays (240Hz+) to make fast approach circles visually distinct.

Related Reflex Benchmarks & Guides

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