Viewpoint0232 How is that? On paper it seems to be the perfect solution but I heard the sync is not very reliable.
There have only ever been two occasions over the last couple of years I've been using it when the sync has not worked, due to hosted server issues. But if you get onto the Matrix group and ping the maintainer, things get fixed up pretty quickly. It's also possible to self-host, but I'm happy to just pay the US$24 per year to not have to worry about that.
I access it on phone and two Linux computers, all pretty seamlessly for almost all the time.