Features
- Plain-English explanation of 80+ common functions.
- Step-by-step from the innermost part outwards.
- Formula tree showing nesting.
- Cell references explained, including locked $ references and other sheets.
- Tips on common mistakes (approximate VLOOKUP, IFERROR hiding errors, slow volatile functions).
How to use it
Copy the formula from the formula bar (including or without the = sign) and paste it.
Read "In short", then the steps. The tree shows which part sits inside which.
Free and private
Everything happens inside your browser: your files are read on your own device and are never uploaded, stored or seen by anyone else.
Questions
Does it use AI?
No - a rule-based parser reads the formula, so the same formula always gets the same explanation and nothing is sent anywhere.
It says a function is not in the list
Rare and newer functions are shown by name; the rest of the formula is still explained.
Is it free?
Yes - free and unlimited, with no sign-up and no watermark.