I would suggest taking look at Quick Base [1]. We've been using it for years and I've found it hits the sweet spot for us in the complex spreadsheet/light database space.
I've been following Airtable for a while and I have high hopes they continue their upward trajectory. I like where they are going, and they seem like the most likely alternative if we were to move, but Quick Base still seems to have a leg up in a lot of areas. Cross Application/Database Connections, Webhooks Support, and automated table sync from Dropbox/Box/SFTP just to name a few.
I agree. I think Airtable's interface (ease of use, responsiveness) is leagues ahead of Quickbase, but Quickbase still offers a more complete feature set, and in many cases one missing feature can cripple a use case (e.g., QB offers predecessor/successor dependencies for project tracking by linking to other records in the same table, Airtable does not).
We've tried out Airtable but ended up using Podio and eventually, Fusioo - http://www.fusioo.com. More of a database (not spreadsheet) for bigger companies though and they don't run a freemium model.
