Multiple minor UI glitches, search and note organization is a mess, the app is not local-first, it lacks offline mode which would be guaranteed to work on a plane, the editor is not bad but might be better, no encrypted backups, extremely limited set of syntax highlighters. And many, many other issues.
Across everything I've tried, Standard Notes seems to have the best set of tradeoffs, but they refuse to implement features (like add syntax highliters for modern lagnuages, if I remember correctly, they said that they would only consider it if I prove that thousands of people need it).
Anytype provides good privacy guarantees but they have crappy UX and, ergh, their app needs 5 seconds to start on a modern mac.
The whole notetaking apps market is a shitshow and a total mess. Don't waste your time and money on these half-backed subscription-based electron apps.
It seems to me you are looking for a syntax highlighter in a note taking app. Which modern language are you looking for?
There are encrypted backups. Actually, backups are encrypted by default.
Notesnook also works offline by default so there's no need for a special mode. It's also, obviously, local-first since everything gets encrypted on your device. We don't have a lot of options there.
