 Kapor founded Lotus after leaving his post as head of development at VisiCorp, the distributors of the Visicalc spreadsheet, and selling all his rights to VisiPlot and VisiTrend to VisiCorp.Shortly after Kapor left Visi-Corp, he and Sachs produced an integrated spreadsheet and graphics program.Even though IBM and VisiCorp had a collaboration agreement whereby Visi-Calc was being shipped simultaneously with the PC, Lotus had a clearly superior product.