redsolver
commented
4 years ago None of the apps you listed except Epsilon Notes supports KaTeX or AsciiMath. Also, Epsilon Notes has it turned off by default because of performance reasons. Noteless also supports mhchem and mermaid.
To offer all of this, Noteless currently uses a WebView which makes the process quite slow.
The solution is to render all of this directly in Flutter (like GitJournal does), but this also means you don't have the special rendering stuff like KaTeX and basically get a "just Markdown" version.
Another option is to port all of this rendering libraries to Flutter and Dart and maintain them. Some are already available (https://pub.dev/packages/catex).
emdoe
dmotte
meadows19
Notes, even not particularly long ones take 1-2 or more seconds to load. It's especially jarring that sometimes the screen flashes white after loading. A better load animation might help a little with perception, but I don't know how much. Other markdown apps (ones made with flutter too) take at most 0.5 seconds on my device, and it really feels different.