On this topic, I really love Kanban boards, but a hosted version (or self-hosted) is not as appealing to me as a native app with some sync.
Years ago, I used to use a closed source but free desktop app on Windows (now long discontinued though) and found that it worked very well for me to track my work.
Apple’s Reminders app has Lists that can be further divided into Sections and then viewed and used (kinda) like a Kanban board, but the UX is not great. The macOS apps, especially, are an abomination with Catalyst.
I’m still looking for a native app that has a simple sync using iCloud or Dropbox. Plus no subscriptions (a one time price per version may be ok). The usage would be for one or two users.