Compares two JSON documents key by key and shows exactly what was added, removed or changed - with an optional order-insensitive mode for arrays.
Sort A-Z, Z-A, numeric, by length or shuffle — with dedupe.
Compare two blocks of text line by line with colour highlighting.
Plain or regex find-and-replace with live count.
Chars, words, sentences, reading time and character frequency.
A grid calculator with a real formula engine: =A1+B2*2, =SUM(A1:B3), 16 functions, and real error cells for #DIV/0!, #CIRCULAR! and #NAME? instead of hanging.
Paste a list of numbers and see whether it fits an arithmetic, geometric, Fibonacci-like or polynomial rule, with the next term and an honest note on how much the fit is worth.
Union, intersection, difference, symmetric difference and unique elements over two number lists, sorted ascending with a count for every result.
Solve the internal rate of return for any cash-flow table with Newton-Raphson and a bisection fallback.
