Standard Notes is an amazing app and it was actually our first inspiration in creating a privacy-focused note-taking app.

Security & encryption wise, both apps use the same encryption algorithms, afaik.

However, Standard Notes is expensive ($9/m) whereas Notesnook is only $4.49/mo.

Notesnook's organization is more flexible; it has tags, colors, notebooks & topics. In comparison, Standard Notes only offers colors and tags.

Notesnook's mobile app experience is almost the same as the web verison. There's almost 1:1 feature parity. Whereas in Standard Notes, the mobile version lacks many of the main features.

We also have more export options (you can export notes as pdf, html, md or txt). On the mobile app, there's also Quick Share that allows you to share any text or link directly into the app without switching contexts (apps).