I use mares dive organizer, it's a free app. Got pointed in that direction because I have a Mares dive computer and can export all data but I also added manual dives based on my log from the time before I got a computer.

But if you don't have an import requirement, then there are better dive apps. I would definitely advice for it because you have a backup in case your dive log gets lost.

And it's fun to ad dive maps and pics so you can check back how the dive spot was when you go back years later.