What are some alternatives?
Appizy - Convert spreadsheet to web application
Publisheet - Publish your Excel sheets to the web as dynamic web applications with formula support.
Excel Online - Excel Online, part of Office Online, is the online version of Microsoft Excel.
CALCONIC_ - Build & add interactive calculators to your website! Choose from more than 50 premade calculators or build your own from scratch. No coding required. Free plan available. Zapier Integration. Publish Anywhere.
Keikai - Fastest web spreadsheet for Big Data
Awesome Table - Display Google spreadsheet data beautifully