Look at Grist.

You maybe justly concerned for it being an open source project that is backed by one small company that sells hosted plans.

The difference is that Grist is a core part of the French Government’s open source web applications La Suite

https://www.getgrist.com/

https://lasuite.numerique.gouv.fr/produits/grist

I am using Baserow (https://baserow.io/) happily.

Fibery is free for small team (but not an open source).