It's an alternative jellyfin + radarr + sonarr (jellyseer) front end. It's in very early stages but it looks and feels so good. I read on the issues that work will progress but there needs to be a lot of planning.
Anyway, it looks good! star it and watch out for the next release
Tried it myself a whole ago, but indeed was a little to early stages. Hope it's gotten better now though. Personally fell onto ombi over jellyseer too. Would love to see an update post on how you feel about if you end up using it for a while 👍
If I'm remembering correctly, Jellyseerr is the only one that has integrated account authentication with Jellyfin (which I have using my standard LDAP for accounts).