Free auditory reaction time test. Measure how fast you respond to a sound cue in milliseconds using Web Audio API. 5-round average, best and worst tracking, false-start detection. Browser-based, no install.
Wait for the beep, then press the button (or Space). The timer fires a short oscillator tone after a random 1.5–4 second delay — this measures how quickly you can respond to sound, separate from the visual reaction time most tools give you.
Instructions
Click or tap the black stage to start a round. A beep will play after a random 1.5–4 second delay — click as fast as you can when you hear it. Keep headphones or speakers on. Pressing Space also works.
Click to start
A beep will play after a random delay. Click immediately when you hear it.
—Last (ms)
—Average
—Best
—Worst
Tip: wired headphones give more accurate results than Bluetooth (BT audio adds 40–200 ms of codec latency).
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Auditory Reaction Time Test is a free, browser-based audio testing tool that lets you measure response to a sound cue in milliseconds using Web Audio API.
Cost: Free, no signup
Install: None — runs in the browser
Privacy: Runs locally, no uploads
Platforms: Windows, macOS, Linux, Android, iOS
Time: Under a minute
How The Auditory Reaction Time Test Works
The test uses the Web Audio API to play a short 880 Hz oscillator tone after a random delay of 1.5 to 4 seconds from when you start a round. The moment the tone fires, the timer captures performance.now() on the audio thread. When you click (or press Space), it captures performance.now() again and subtracts — the result is your reaction time in milliseconds. This is different from the visual reaction test most sites offer: your brain processes sound through the auditory cortex (and brainstem for reflexive startle), not the visual cortex, and the two paths have measurably different latencies.
Why Auditory Reaction Is Usually Faster Than Visual
Textbook visual reaction time in healthy adults averages 200-250 ms, while auditory reaction averages 160-200 ms. The difference comes down to neuroanatomy: sound hits the cochlea and travels through only 2-3 synapses before reaching auditory cortex, whereas light must traverse the retina, optic nerve, LGN, and visual cortex before a decision can be made. If your auditory score on this test is significantly higher than your visual score (on a separate tool), the culprit is usually audio latency — wireless headphones or speakers with DSP processing add a systematic delay that has nothing to do with your nervous system.
What Affects Your Score
Caffeine, sleep, time of day, and age all shift reaction time by 10-30 ms each. Most adults are fastest in late morning to early afternoon and slowest late at night or immediately on waking. Fatigue and alcohol slow reactions dramatically. Practice helps for the first 5-10 trials as you learn the task, then plateaus. Hearing loss in the relevant frequency range (the 880 Hz tone sits in the middle of speech frequencies) can slow detection — if you struggle to hear the tone at moderate volume, that is a cue worth checking with a frequency response test.
Headphone And Speaker Latency
The test assumes sound hits your ears the moment the Web Audio timer marks the start. That is approximately true for wired headphones (under 10 ms), less true for USB-C DACs (10-30 ms), and very untrue for Bluetooth — SBC and AAC codecs add 150-250 ms between the browser and your ears. If you are running the test on AirPods or generic Bluetooth headphones, your measured reaction time is actually headphone latency plus reaction time, so the number will look much slower than reality. For a fair test, use wired output; for cross-session comparison, keep the same audio device.
Do You React Faster To Sound Or Sight?
Most people react to sound about 20-40 ms faster than to light, because an auditory signal reaches the brain in roughly 8-10 ms versus 20-40 ms for a visual one. You can prove it on your own hardware: run five trials here, then five on the visual test, and compare your averages. Our do you react faster to sound or sight guide walks through the experiment, the benchmark ranges, and the Bluetooth-latency trap that quietly ruins the comparison.
Why is my auditory reaction time faster than my visual?
Sound processing takes fewer neural steps than vision. The brainstem handles basic auditory detection before the signal even reaches the cortex, and the auditory cortex is just 2-3 synapses deep.
Why are my times all around 250 ms on Bluetooth headphones?
Bluetooth SBC / AAC codecs add 150-250 ms of latency between the browser and your ears. Your actual reaction time is whatever you measure minus that latency. For fair results, use wired headphones or a wired 3.5 mm speaker connection.
What is a good score on this test?
140-180 ms is very fast (e-sports pro range). 180-220 ms is above-average. 220-280 ms is the typical adult range. 300+ ms suggests fatigue, sleep deprivation, wireless audio latency, or hearing loss in the test-tone frequency range.
Why does the test require clicking first?
Browsers gate audio playback behind a user gesture to prevent pages from auto-playing sound. The first click arms the Web Audio context so subsequent beeps fire instantly.
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