5 stars: This is great for tracking practically everything on your island. I've witnessed a few of the updates and I've been very pleased with what's been added! The game is still relatively new and the information this app holds is incredibly useful and is constantly being improved. If you have ACNH, I definitely recommend downloaded this app.
3 stars: It's pretty good at the moment. I find it highly effective for tracking certain collections. However the order of some collections and the fact that you can't sort collections (for example alphabetically) makes it incredibly frustrating to use for some collections. If a sort function is added I'll change my review to 5 stars, but for now that drawback makes it enough of a pain to use that I feel like 3 stars is fair.
5 stars: Great progress tracking! The catchable now feature is very appreciated, and it looks as if updates are rolling in as things are discovered in the game. My only recommendation is adding a third toggle color the bugs, fish, and fossils for museum donations. I share an island with my kids and tracking this helps me help them.
3 stars: Great app, seems to be getting better constantly. Fish and bug \
5 stars: Very good job so far. It's really helpful to see the creatures that will be leaving that month are highlighted in red. Locations on where, when, and how to find them is also listed. There is no money-locked features, nor are there ads, which I like. There is a few, minor translation issues...