I've had good luck with syncthing. But I only sync between laptop and desktop.. the mobile story with syncthing isn't ideal.
Why not? I've used it between my desktops and my phone with no problem for years.
I use syncthing on mobile with no problems. Depending on your settings it might not work on low battery though.
Why not? I've used it between my desktops and my phone with no problem for years.