find the difference

Find and delete empty folders, even with .DS_Store files inside.

It can calculates the reliability of difference scores.

Give it two dates and/or times, and it tells you the length of time between them

Find and remove duplicate files.

Find out when and where your Apple product was built.

Find prime numbers.

Find possible permutations for a set of letters.

Find the number of string occurrences within a large text.

Find duplicate songs in your music collection.

Find which apps are keeping files locked.