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typed correctlymistakestill to comewhere you are
Words per minute tells you where you are, not what to fix. Typerra records the timing of every keystroke you make and reports three things that ordinary typing tests throw away.
Whether you press the next key before releasing the last one. One of the strongest predictors of speed in the research (r = 0.73), and a behaviour ordinary typing tests do not report.
How fast you move between the hands compared with within one hand. Slow typists show a distinctive reversed pattern here.
Wrong letter, missing letter or extra letter. These are not equally bad, and one of them tracks slowness far more closely than the others.
The three metrics and the thresholds used to interpret them come from Dhakal, Feit, Kristensson and Oulasvirta, Observations on Typing from 136 Million Keystrokes, CHI 2018, a study of 168,960 volunteers producing 136 million keystrokes. Read these as indications, not measurements. Browser key timing is precise to only about 10 to 15 milliseconds, so any difference smaller than that is noise, and the authors themselves flag the left-versus-right hand gap as needing replication. Their sample was self-selected, 68% from the United States, mostly young, and over 70% had taken a typing course, so the comparison groups are not a cross-section of the general population. The error-type correlations come from a 783-participant subsample rather than the full dataset.
What began as patient advice from my father, Dr. Md. Jakariya, urging a young boy to learn to type without ever looking down at the keys, became a skill I have leaned on every day since.
Having now lived its value, I built Typerra to pass that same quiet advantage on to someone else.
— Mohammed Fahim Murshed
Dr. Md. Jakariya is a professor at North South University and an adjunct professor at the University of Manitoba.
How often you started the next key before letting go of the last one.
Average gap between two keys, grouped by which hand each key belongs to under standard touch-typing. This is read from the keys themselves, not from your actual hands, so it assumes conventional fingering. Lower is faster.
Counted only in words you finished, and only where you left the mistake in. The "keys hit wrong" figure above counts every wrong keystroke, including the ones you went back and fixed, which is why the two numbers differ.
The transitions costing you the most time in this run.
Built up across every test you have taken in this browser.