Take a free reaction test online in seconds.
Reflex Checker is a free reaction checker and testing suite that runs right in your browser. Test your reaction time, memory, focus, speed and accuracy, then compare your results over time. No sign-up, no download, no distractions.
Why Use Reflex Checker?
Quick, focused tests for reaction time, reflexes, memory, attention, accuracy and speed. Pick a tool, run the test, and compare your results over time on the same device.
Reflex Checker
Take a free reaction test that measures your simple visual reaction time across a five-trial run.
Open testClick Speed Test
See how many clicks per second you can sustain over a timed sprint.
Open testGo/No-Go Test
Test impulse control by reacting to green and holding back on red.
Open testSequence Memory Test
Watch a growing pattern, then repeat it back from memory.
Open testNumber Memory Test
Remember increasingly long digit sequences as each round gets harder.
Open testVerbal Memory Test
Work out whether each word is new or one you have already seen.
Open testStroop Test
Choose the ink colour, not the word, and test your ability to stay focused.
Open testAim Trainer
Hit targets quickly and measure your speed and accuracy under pressure.
Open testTyping Speed Test
Measure typing speed and accuracy over a timed passage.
Open testWhat Is a Reaction Test?
A reaction test measures how quickly you respond to a signal, usually a colour change or a moving target, and turns that response into a millisecond score you can track over time. Reflex Checker is a free reaction test online: no download, no account, just a fast read on your reflexes straight from your browser. Run the reaction time test whenever you like, then check your reflexes again in a few days to see whether you have gotten quicker.
Beyond simple reaction speed, this reflex checker suite covers the other pieces of mental sharpness too: how much you can hold in short-term memory, how well you filter out distraction, and how fast you can move a mouse or a finger with precision. Each test below takes under a minute and works on desktop or mobile, so pick one, get your number, and get on with your day.