I use Anilist. It has a nice clean and user friendly interface. The progressive web app also works well on my device.
I use AniList, Anime-Planet, LiveChart, AniDB, and MyAnimeList
Reasons I use each:
AniList gives good stats and breakdowns of what genres, etc, you tend to prefer in a clean, user friendly format
Anime-Planet gives me generally good recommendations, based on anime I want to see something like, or my overall library preferences
LiveChart's just good at giving me what I'm looking forward to in a good digestible feed. Sometimes I scroll through past seasons to see what I may have missed, this is why I maintain a list there
AniDB gives incredibly detailed analytics, has a cool timeline of all your anime watching history. I think this is just really satisfying to look at
MyAnimeList honestly doesn’t really have much I care about, just people tend to get squirmish if I link them anything else, so it’s the easiest list to send to people without having to explain why I don’t use MALI use a FOSS alternative to MAL, kitsu.io
I use both, if MAL is down there is always Anilist to keep my episodes tracked.
I use anime-planet, just because it was the first thing I found back in the day and I’m not switching now. The scoring systems is a bit limited, using the five stars (essentially just 1-10). I do like the simple design, makes it very clear where everything is, and your profile has a nice big overview of how much of your life you have wasted :D
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Anilist plus taiga. Moved from mal do to it going down for like 2 weeks a couple years back. I can’t remember why it went down but I fully converted to anilist because of it.
I use MyAnimeList, but I’m actually going to attempt to write my own soon enough using Laravel and Vue. I was planning on starting this week, but I’ve been completely knocked out with a viral infection, so I dunno when I will start on it, but I do plan on working on it at some point even though I seem to keep delaying it it’s still something I really want lol.