Seconding (thirding) logseq! Your daily journals all show up in one long scrollable page (delimited by the date and such) so you can easily see what happened previous days, etc. If you click one it brings up that page in full screen if you want to focus on it, it works very nicely imo.

You also aren't limited to just journaling, you can use it for a pkm system. Say that you journal for that day about learning something, you can do this:

• Today I looked into [[eulers_formula]] ** Created by Leonard Euler ** e^(ix) = cos(x) + i sin(x) ** Etc

When you go to the eulers_formula page, all of that info will be in the links section without having to leave the page. I personally do all that, then write my own summary of the info on the page itself, so I have the original content and my take on it.

It's also fully foss, you can pay for their sync service to have it available on multiple devices all the time and it's fully encrypted in transit so they can't see your info, I personally just use syncthing and haven't run into any issues using it on my phone and computer unless you try to modify the same file at the same time (which isn't really something you would ever do)