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Digit span memory is a classic short-term memory test: you briefly see a number sequence, then type it back from memory. Every correct answer makes the next sequence one digit longer, until you make a mistake - the tool then shows you the longest sequence you reproduced correctly. The digits are generated with the browser cryptographic random source. Everything runs locally: no account, no server, no transmission of your results.
In memory research, the approximate capacity of short-term memory has been a well-known concept since George A. Miller's widely cited 1956 paper "The Magical Number Seven, Plus or Minus Two" - roughly seven items, with noticeable individual variation. We do not have a solid, openly published percentile table specifically for a browser-based digit-span test, so this tool deliberately shows no computed comparison value, only the digit span you reached.
Concentration, distraction and practice all influence your result: people who group the digits into smaller "chunks" instead of memorizing them one by one usually manage a longer sequence. Your best score, history and streak are stored locally in your browser - with a visible export and delete button, so your data genuinely belongs to you.
Specifications
Specifications
Input formats
No file (generator)
Batch processing
No
Processing
Locally in your browser (JavaScript)
File upload
None
Limitations: Measures short-term retention of a digit sequence via keyboard input - not an IQ test and not a medical or psychological diagnosis. There is no published percentile table for this browser test that we know of, so the tool deliberately shows no computed comparison value.
FAQ
Are my results uploaded or stored?
Nothing is uploaded: the measurement runs entirely locally in your browser. Your best score, history (at most the last 50 runs) and streak are stored locally - you can export them as a JSON file or delete them with one click at any time. There is no account and no server leaderboard.
What does the "magic number seven" mean?
It goes back to a widely cited 1956 paper by psychologist George A. Miller, which describes the capacity of human short-term memory as roughly seven (plus or minus two) items. It is a well-known concept, not an exact prediction that applies to this specific test - individual results vary a lot.
Can I train my digit span?
To some extent, yes: strategies like grouping digits into smaller chunks ("chunking") demonstrably help you retain more. The underlying memory capacity itself cannot be increased indefinitely though.
Is this an IQ test?
No. Digit span memory is a memory benchmark for short-term digit retention, not an IQ test and not a psychological or medical diagnosis.