The vast majority of organizations use some sort of browser-based spreadsheet app, and Microsoft Excel Online and Google Sheets are industry leaders in this area of professional software. Both are also part of larger collections of business software organized into office suites: Excel Online is a Microsoft Office 365 module and Google Sheets is a G Suite application. In many ways Excel Online and Google Sheets are quite similar, especially functionally. I’ve chosen to focus on reviewing twelve functions where I could really see differences between the two pieces of software. These twelve areas are especially relevant for more advanced users; those who have extensive experience working with spreadsheets software.