Shared functions
Core functions — SUMIFS, VLOOKUP, XLOOKUP, FILTER, SORT, UNIQUE — work the same in both. ExcelGPT defaults to compatible syntax and notes version requirements.
Where they differ
Google Sheets has QUERY, ARRAYFORMULA, IMPORTRANGE, and REGEX functions Excel lacks; Excel has GETPIVOTDATA, dotted statistical functions, and bond/securities functions Sheets lacks. ExcelGPT picks the right one for your target.