This looks awesome - once the Christmas rush is over I'll have to investigate it !
I'm starting to really, really dislike World Anvil for all kinds of reason, so being able to move to an alternative (especially if it's basically free, or at least less than World Anvil) is very appealing.
It's wonderful! Best choice for a note app that I've made in ages. Every bit of core functionality is entirely free, it's only their syncing that is paid - and if you're entirely on a single device it isn't even needed.
Even for what I'm doing, I can just copy/paste my files between my PC and my Tablet and it'll be fine. I think long-term I'll pay the $4 USD per month to get sync, but for now I want to see how annoying it is to manually keep it up on each lol.