InstaCalc.com is a very creative startup that contrasts how web sites can be much better then a legacy Software Application.
InstaCalc chose to be better than Excel by doing less. They focus on the scenario of getting a quick calculation accomplished. This contrasts Excel that is a general purpose tool that scales to large spreadsheet.
InstaCalc.com’s focus allows their user interface to be easier to use in these quick calculation scenarios that Excel.
When I want a quick calculation accomplished, I’ll go to InstaCalc. In the less frequent cases of creating an extensive spreadsheet, I’ll go to Excel.