Wisconsin Card Sorting Test online: find the hidden rule

Match each card to 1 of 4 reference cards by color, shape or number. Nobody tells you the rule, and once you have it, it changes. Your result shows how quickly you notice and let go.

6 categories · up to 128 cards · about 7 min

Start the Wisconsin Card Sorting test

Your result appears as soon as the sorting ends, and a free account saves it.

Works best on a computer.

3 triangles: card 1 or card 3?Shape points to 1, number to 3 · the tick settles it

How it works

A short practice, then up to 128 scored cards. Speed is not scored, so each choice can take as long as you need. About 7 minutes in all.

1 · Practice
5 cards with a hint
You sort 5 practice cards, with a hint to try color first. Each one gets feedback and none of them count.
2 · Every card
Pick a reference card
A new card appears under the 4 reference cards. Click or tap the one you think it belongs with: cards can match by color, shape or number.
3 · After each sort
Right or wrong, nothing more
A green tick or a red cross shows for about a second. Nobody names the rule; that mark is all you get.
4 · Without warning
The rule changes
After a run of correct sorts the rule switches to a different one. No message announces it, so a cross after a streak is your cue to look again.

Under each card a counter shows the trial number and how many categories you have completed so far. A card left unsorted for a full minute moves on without being scored. The first screen has a button that reads the instructions aloud, and a 3, 2, 1 countdown separates the practice from the scored cards.

Esta Berg and David Grant described this card sort at the University of Wisconsin in 1948 as a way to measure flexibility in thinking. This version keeps the classic reference cards, 1 red triangle, 2 green stars, 3 yellow crosses and 4 blue circles, and the classic length: it ends after 6 categories or 128 cards, whichever comes first.

What it measures

Each sort is a guess you test against the feedback. The task is built so that the guess that worked a moment ago stops working.

Finding the rule

Concept formation: seeing that color, shape and number are the possible ways to group the cards.
Learning from feedback: keeping a guess after a tick and dropping it after a cross.
Keeping the current rule in mind card after card, a job for working memory.

Letting it go

Set-shifting: noticing that a rule has stopped paying off and trying another one.
Resisting the old habit: not sorting by a rule that was right until a moment ago.
Staying with the new rule once the ticks confirm it, instead of drifting away.

Perseveration means carrying on with a response after it has stopped working. Here it shows up as sorting by the previous rule after the switch, cross after cross, which is why perseverative errors get the most attention in research on this test.

Good performance draws on several abilities at once, so a low score does not point to one skill or one part of the brain. The task was long tied to the frontal lobes, and later reviews found that damage elsewhere in the brain can affect it too.

A test, not a diagnosis.

These counts come from a single run of a single task. On their own they can neither diagnose a condition nor rule one out.

What you get

The result screen opens the moment the sorting ends.

On the result screen

A one-line summary and a marker on a scale from flexible to rigid.
Categories completed, out of 6, with a short reading of what that number suggests.
Perseverative errors: how often you kept sorting by a rule after it had changed.
Total errors and your error rate as a percentage.
A full data panel with trials used, non-perseverative errors, trials to finish the first category and the perseverative error percentage.
A CSV download of every sort: the card, the reference card you picked, the rule in force and whether the error was perseverative.

Once it is saved

Stored in your results with a free account, ready to open on another device.
Set next to the other tests you take, so executive function sits beside memory, speed and reasoning.
A Continue button that leads straight to your next test.

How this version is scored

Every sort is logged with the card, your choice and the rule in force, and the counts below come from that log. The rule changes without warning after a run of correct sorts, and the test only works if you do not know the pattern in advance, so this page does not say how long the run is or which rule comes next.

Category: A run of correct sorts under one rule, which ends when the rule changes. 6 categories is the most anyone can complete.
Trials: Every card you sort in the scored part, up to 128. The 5 practice cards, which are judged by color, and any card left to time out are not counted.
Perseverative error: A wrong sort that matches the rule of the category you just completed: the old rule is still steering you. No sort in the first category can be perseverative, because there is no earlier rule yet.
Non-perseverative error: Any other wrong sort, such as a stray guess or trying a rule that never applied. It equals total errors minus perseverative errors.
Trials to first category: How many cards it took to complete your first category. The fewer cards, the sooner you found the first rule.
Error rate: error rate = total errors ÷ trials × 100. The perseverative error percentage in the data panel puts perseverative errors in place of total errors.

A simpler rule for perseveration. The test manual by Heaton and colleagues scores perseveration with a more detailed set of rules and adds scores such as failure to maintain set and conceptual level responses. This version uses only the definitions above and does not compute those extra scores, so its counts are not interchangeable with a clinician's scoring.

Where this version differs. In the card version an examiner says right or wrong after each card and nothing more. Here the counter shows when a category ends, the practice already points you to color and the cards are dealt in a new shuffled order on every attempt.

Before you start

The counts mean more when the conditions are calm.

For a fair run

Set aside about 7 minutes without interruptions; there is no pause button.
Use a computer or tablet if you can: the shapes are easier to count on a larger screen.
Expect crosses. Working out a hidden rule means testing guesses, and wrong sorts are part of that.
Keep this tab in front until the result appears.

Interpret cautiously when

You are tired, unwell or rushed, or something keeps pulling your attention away.
Telling red from green, or any of the 4 card colors apart, is hard for you.
You have done this test before. Once the rules are known the task gets much easier, and scores tend to improve on a second attempt.
You already knew the pattern of rule changes before your first attempt.

Questions

What does the Wisconsin Card Sorting Test measure?

It measures how well you work out a rule from right and wrong feedback and how readily you drop that rule when it stops working. The second part, often called set-shifting or cognitive flexibility, is what perseverative errors capture. The task also leans on attention, working memory and abstract reasoning, which is why it is grouped with tests of executive function.

What is a normal score on the Wisconsin Card Sorting Test?

Most healthy adults find each new rule within a few cards, complete most or all of the categories, and make some perseverative errors just after a switch before moving on. What stands out is a long run of sorts by the old rule despite the crosses. Clinical norms come from the examiner-run card version and are set by age and education. A study of computer versions found they did not match that version, so this page prints no norms, and the result screen reads your counts against fixed ranges rather than giving a percentile.

How long does the Wisconsin Card Sorting Test take?

About 7 minutes, including the instructions and the practice. Speed is not scored, and the test can finish early: it stops as soon as you complete 6 categories, or after 128 cards if you get there first.

Can I take the Wisconsin Card Sorting Test on my phone?

Yes. The cards shrink to fit a narrow screen and you tap a reference card to sort. The shapes are small on a phone, so a computer or tablet gives a clearer view, and on a phone the tests hub first shows a short note that a small screen can affect what you see.

Can I retake the Wisconsin Card Sorting Test?

Yes, from the tests hub, as often as you like. The task depends on discovering rules you have not seen before, so a second attempt is rarely as hard as the first: in one study, 50 men scored better when retested a full 12 months later. Your first attempt is the most informative, and later runs are best compared with each other.

Sources

By Cristian Dominguez Rein-Loring, Creative Technology Lead · Updated October 10, 2026