There's desktop apps for Linux/Win, an app for Android and browser integration.
Linux
Everything about Linux
RULES
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Be nice to each other.
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No memes or pictures of Linux in the wild.
Bitwarden, Bitwarden, Bitwarden. Use their free vendor-hosted service, and don't fixate on self hosting or handling syncing of local files. They are highly transparent and well regarded, and this is the way to go if you want any hope of converting your family.
Keepass Password Safe: I started it on Windows, moved on to OSX for 10 years and am now exclusively on Linux and my Keepass library migrated through all OS's. Used it too on both iOS and Android. My Keepass file lives on my online cloud storage so it's accessible for all means.
What app do you use on iOS? I used Keepass for a while but switched to bitwarden because of the bad apps (i tried 2 or 3) on iOS.
It was definitely touch-and-go for a while but a couple years ago Keepassium popped up and I recommend it highly as a Strongbox competitor.
Bitwarden or Vaultwarden.
Bitwarden works nicely. It will work locally unless you sync as far as I know.
I'm using keepassXC for that, there are clients for Linux, Windows and Android. Also there are browser plugins. The android app I'm using is KeepassDX, you also find it on f-droid
I'm using it for years now, started out syncing it to Google drive, but nw i have my own nextcloud server
If you don't want to self host then I suggest Bitwarden as the only service I would recommend. If you want/are willing to self host Bitwarden. Just stay away from Lastpass.
I can wholeheartedly support that statement. Been using a locally hosted bitwarden instance for a few years now, never head an issue and the Browser plugins work great.
Also: actual desktop clients on all three platforms
There are some discussions on HackerNews, about some VC which invested there and what the impact will be, but nothing actually popped up