What are some alternatives?
When comparing Appizy and Keikai, you can also consider the following products
SpreadsheetConverter.com - Use online spreadsheets, smart forms and beautiful charts in your blog or website. Put your booking and order forms online. Show live charts. Change any cell and the online spreadsheet or live chart immediately updates itself.
EtherCalc - EtherCalc is a web spreadsheet.
SpreadsheetWEB - SpreadsheetWEB is a no-code platform that helps businesses translate their collective Microsoft Excel expertise into robust web applications with limited or no reliance on IT resources.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Awesome Table - Display Google spreadsheet data beautifully
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.