It is extremely minimal and elegant, does everything that you're looking for (on first glance), and is completely free. Not to be hyperbolic but the interface is ingenious in it's power and simplicity. Give it a shot.
It's not completely free. [0] A set of features are available free. The complete set of features runs > $4/month, depending on whether you pay monthly or yearly.
I use the app for work and personal note taking, todo lists, etc. and have not run into any limitations of the free plan in the last five years of daily usage.
It's an online service, isn't it? Not a local application.