Question on Okinawa, Japan

Any Recommendations for good DIve Apps

I'm trying to find some good dive apps to both use and review ?

There are so many I thought id find out what other people are using first and what you think of them.

Ideally I'm looking for : a log book but ideally with map features, a good community or local buddy finder , a good reliable dive planner and maybe a good fish id or reef life one?

Be great to know what everyone else uses and finds helpful :)