Repetition is a fingerprint: in any pile of numbers, the same value showing up again and again is usually the most interesting thing in the pile - a repeated ID, a duplicated reading, a mode waiting to be found. Counting occurrences turns a raw list into a tidy tally: value, count, frequency, and the repeat champion at a glance.
Count Number Occurrences takes any list - lines, commas, spaces - and counts exactly how often each value appears. Sort by frequency, by value or by first appearance; copy the tally as text or download it as CSV. Values are compared as text, so huge numbers, decimals and signs all count precisely. Everything runs in your browser.