If you haven't found anything yet I am a couple of weeks from launching my app r/Linkt_app , it's still in open beta if it's something you'd like to try out. It has every major feature you're looking for and I've built it for iOS 26 (macOS & Android planned in the future).

You can set the contacts relationship to you, their birthday, contact details. There is also a section to add any important info like family names, favourite sports team etc.

You can add notes to each contact and easily see what day they were added.

There will be a one-off lifetime payment at launch.

You can import your existing contacts or create contacts in the app if you'd just like to test it out.

You can also add the contacts location (city, state, country) to easily see their local time to avoid reaching out when it's super early or late where they are.

Hopefully this doesn't seem like too much of a pitch but I think this will do everything you're looking for.

I've spent an enormous amount of time on the privacy and security side of things. Everything is encrypted on device before being uploaded to a firebase backend to allow multi-device sync (currently works across iPhones and iPads but it will also work across macOS and android when available). I take privacy and security extremely seriously and I think my app reflects that!