Here is a detailed comparison between following database solutions:
Airtable
Knack
Zoho Creator
Ninox
Missing is Coda out of the bigger names, which I suggested to the author if he doesn’t mind to review in the future. He has done a good job summarizing it. It is already a bit outdated but still gives a good general direction of somebody who doesn’t know how these solutions compare.
http://software.kirknessassociates.com/blog_files/1402e4388e883ad57ce3c039b35528c3-34.html