I considered KeePass+ Synching but tended to run into the same issues as with Owntracks - Android is hostile to always on background apps. Then when it came time to onboard my spouse, KeePass wasn't an option.

Both Android and iOS have issues with syncthing here for my obsidian syncing and it drives me nuts.

I don't understand how people keep recommending Syncthing like it's a magical solution. It is not, it fails constantly, has weird, unfixed upstream bugs if you use encryption. It's definitely a maintenance burden as well.