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Measure how quickly you respond after a visual signal changes. Practice five randomized trials and compare your median, no

Respond to one of four colored signals by choosing the matching labeled button, combining reaction speed and decision accu

Practice attention and impulse control by tapping only green GO signals and ignoring red STOP signals.

Measure your response to a short sound signal using your device speakers or headphones, with several repeated trials.

Test your words per minute, raw typing accuracy and corrected character counts on randomized passages.

Practice accurate digit entry on generated number sequences and measure speed without recycling the normal prose typing te

Measure the number of pointer clicks registered during a timed five-second clicking challenge.

Measure rapid keyboard spacebar presses over a short timed interval.

Check how quickly you complete deliberate pairs of clicks, with timing for individual double-click attempts.

Play a touch-first rapid tapping challenge with large targets that work on mobile screens.

Click twenty randomly positioned circular targets to practice precise cursor movement and target acquisition.

Track and click a continuously repositioning abstract target while its location changes at measured intervals.

Remember and replay progressively longer sequences of colored pads in a Simon-style memory game.

Recall randomly generated numbers that grow in length as you succeed at each memory level.

Study a set of highlighted squares and reproduce their locations after they vanish.

Flip pairs of covered cards and remember where each symbol is hidden to finish with fewer turns.

Decide whether a word has appeared before as familiar and unfamiliar terms alternate.

Solve fresh arithmetic questions under a timer and improve mental calculation speed and precision.

Infer a missing term from generated arithmetic or geometric-like numeric patterns.

Quickly identify the one different symbol in a randomized grid of lookalikes.

Pick the subtly different shade from a grid of colored blocks, with increasing difficulty.

Name the visible ink color rather than the written color word in a classic interference-style game.

Spot a designated shape in a randomized visual field of distractors to test search speed.

Run a precise browser stopwatch with start, pause, reset and lap tracking.

Set a custom countdown in seconds or minutes with a visible progress indicator and optional sound.

Tap a steady rhythm and calculate its beats per minute using the average time between recent taps.

See which key events your browser detects while testing an attached keyboard, including modifiers and repeat signals.

Inspect browser-visible left, middle and right mouse events and wheel direction within a dedicated area.

Estimate the time needed to read or speak your own text with an adjustable words-per-minute assumption.

Count words, characters, sentences and paragraphs locally without uploading your text.