Any spreadsheet or POS export works: columns are auto-detected and you confirm the mapping before import. One row per product (add a week/date column for time playback). If sales, units, margin and stock columns are present, GMROI and turnover are derived automatically. Everything stays in your browser; nothing is uploaded to a server.
Each column's role was guessed from your file, so any spreadsheet or POS export works. Fix anything that looks wrong, then import. Values like "$1,234" or "12.5%" are read as numbers automatically.
Add one product by hand. Name is required; SKU and barcode let it match (and pick up metrics) on your next data upload. Any metric columns already in your data appear below.