I use both Anime-Planet and MAL.

I joined Anime-Planet one time MAL had an outage, I think. Both sites have their advantages. A-P has a very rich database of tags, for both anime and characters, and also has a personal feed history that stretches back way longer than MAL’s does. On the other hand, MAL includes metadata fields for when I started/finished watching something, and has some third-party sites that integrate with it, such as anime.plus, which I use to see stats on how much I’ve watched and when and how I’ve rated things.

So, for now, I just use both at the same time.

I once tried Kitsu, back when it was called Hummingbird, but I wasn’t very satisfied with it. Haven’t ever tried AniList or AniDB.

I use AniList. I also have automatic tracking in Tachiyomi and on my Jellyfin server through a plugin. There’s also a browser addon for that called MAL-Sync, which I used before. Without automatic tracking I’d be too lazy or forget to update my progress.

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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.