I tried Hoarder (KaraKeep) & Linkwarden. Both excellent but I preferred the UI for Linkwarden, particularly on mobile, so I stuck with that - i found Hoarder awkward to edit thumbnails for example though things may have changed in KaraKeep. From Android perspective both have apps but I prefer to use browser plugin. With Linkwarden there’s some hoops to jump through on Android Firefox but it works perfectly once set up. Both excellent choices.