The review
What it does
Sumwise works inside your spreadsheet. Ask for what you want ('total sales by region for Q3, excluding refunds') and it writes the formula, explains in plain English what it will do and shows which cells will change. Nothing is applied until you approve, and every AI edit is in the undo history.
Why we like it
Spreadsheet errors are quiet and expensive. The explain-then-confirm step catches misunderstandings before they spread through a workbook, and it teaches people formulas as a side effect. It's also good at auditing: point it at an inherited spreadsheet and it describes what each tab does.
Watch out for
- Very large workbooks slow it down noticeably.
- It sometimes chooses a clever formula where a simple one would be easier for colleagues to maintain. Ask for the simple version.
- Pivot-table support is still basic.
