Cool home page I wish mine was that good. Impressive UI.
Related work: (my stuff) http://www.cellmaster,com.au/AppBuilder.html The product is is different, unlike other approaches, you can create sophisticated custom software. Create custom software, with spreadsheet formulas, the kind a only programmer is able to create.
http://stoic.com - this is maybe the closet to relatable.io
http://www.spreadsheetconverter.com
http://www.forguncy.com/ (Japanese)