Simple database app?

I have been using Bento on both IOS and OS X for some years. This database software has been discontinued and will therefore not take advantage of the features of IOS.

I am looking for a good replacement which will ideally work across both operating systems, but which doesn't cost me an arm and a leg as Filemaker Pro would do. I don't necessarily need the relational features of a complete database application.

Does anyone have a recommendation?