Flexbooru

It's pretty comfy to download pics and webms with this app, but it lacks several important functions like checking profiles, posting comments, seeing one's favorites, etc. On top of that, it's incredibly complicated to set up, search bar doesn't work properly sometimes, it won't arrange tags as it should (which is pretty awkward in Sakugabooru, for example) and it won't show thumbnails several times for no reason.

I use this primarily with Gelbooru. I don't use Muzei or downloading. Major selling point for me is that I can favorite to my actual Gelbooru account rather than a local database. Pros: tags saving for searching works well. Grid options are perfect. UI is fantastic and searching is quickly accessible. Cons: zooming has strange constraints—sometimes can't even zoom. Lack of any pagination.

Despite how complicated the app can be, it is a very versatile image board tool that, when learned, has the ability to be the best tool. I use it a lot and the SauceNAO, Muzei, and WhatAnime? tools are really useful. Features are being added in constantly and with that comes streamlining and simplicity with slight complexity. I purchased the pro and I'm excited to see more features.