No syncing built in, it just works on a file and you can use whatever service you want to sync that file. Most of the dropbox-style services will work (although

No syncing built in, it just works on a file and you can use whatever service you want to sync that file. Most of the dropbox-style services will work (although on mobile sandboxing can sometimes be an issue). On Linux keepassxc is great, with strong browser integration and even has a good extension for integration with ssh-agent. I don't use iOS myself, but a quick search shows Strongbox as a decent client. On Android I use Keepass DX which is very good by the sync support isn't there. Keepass2Android is better on that front, but has a much worse UI and no support for the new biometric auth process, only the old fingerprint-specific one.