Brain Trainers

Click targets as they pop up and get scored in targets per second. Shooter players use it to warm up before a session.

Dual n-back, the working-memory drill psychologists keep arguing about, implemented properly and charted over time.

A scrappy free collection of brain teasers and n-back drills that has been quietly online since long before the app stores existed.

A plain, ad-free bank of cognitive tests — n-back, digit span, Stroop, mental rotation — that keeps a history of your scores.

The 1978 electronic memory toy rebuilt faithfully in a browser tab, still beating most grown adults somewhere around level twelve.

Reaction time, sequence memory, the chimp test and verbal memory, each scored against millions of other people's attempts.

Millions of chess tactics pulled from real games and served at exactly your rating, entirely free and with no account required.

The best-known brain-training subscription, with a free daily set of games and rather a lot of graphs about your own decline.

Hundreds of matching-pair memory games plus Simon-style sequences, scaled from toddler difficulty to genuinely unpleasant.

The one free IQ test people actually cite: thirty-five matrix puzzles, twenty-five minutes, no email address demanded at the end.

The colour-word interference test as the real psychology experiment rather than a quiz-site imitation, with your data at the end.

Find one to twenty-five scattered across a grid, in order, against the clock. The standard peripheral-vision and attention drill.

Word association against a neural net: type anything related to the highlighted block and it clears. Built by Google's research team.

Paste any text and it flashes one word at a time at a speed you pick, which is either speed reading or a mild trance.

Two minutes of mental arithmetic at whatever difficulty you set, boiled down to a single number. Trading desks drill on this one.