[ludicast]

fieldbook.com seems to check a lot of your boxes.

it has plenty of rough edges but has a solid relational model and is fun to use.

my only complaint is that api access is really expensive (making it cost-prohibitive to most HN readers) but the main product is cheap/free.

[jasoncrawford]

Fieldbook co-founder here, thanks for the mention. If anyone has a particular need for lots of API calls, message us and we might be able to work something out!

[ludicast]

That's great to hear, I'll follow up via email.

Great product.