What are some alternatives?
When comparing Elastictable and Google Sheets, you can also consider the following products
Jexia - Build scalable, reliable and real-time (mobile)applications faster and easier.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
FaunaDB - FaunaDB is a serverless cloud database that offers fast global access to data via modern APIs like GraphQL without sacrificing data consistency. Ubiquitous, flexible and secure, FaunaDB helps modern developers build applications fearlessly.
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
EtherCalc - EtherCalc is a web spreadsheet.