What are some alternatives?
When comparing Appizy and LibreOffice - Calc, 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.
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
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.
Publisheet - Publish your Excel sheets to the web as dynamic web applications with formula support.
EtherCalc - EtherCalc is a web spreadsheet.