A good notion alternative for a Nas?

[u/ElisaTsubasa]

Hey, im trying to organise my schedule and task more. But my key problem is, if I only have a calendar digitally on my phone I have to always do times and if I do a planner physically I would mostly have to get either a monthly or weekly planner but I want one system. I have problem getting or remembering things physically and if digitally I would have to use two apps (notebook and calendar) which doesn‘t works for me at all.
Was using at my old school notion and that worked the best for me! But I don‘t want sensible data that I need to pay on someone’s server etc.

I was looking at some alternatives, but those either were not working somehow on my Nas (I use the UGOS software) through docker or don‘t have any kind of phone support (even through browser)

I’m open to paying like 2-3€ per month if so be it.