[myguestacc]

markwhen.com looks neat! What tech did you use to make the editor?

[koch]

Codemirror & vue. Chances are if you're using a code editor in a web app it's either Microsoft's Monaco [0] or CodeMirror [1], which is maintained by Marijn Haverbeke

[0] https://github.com/microsoft/monaco-editor

[1] https://codemirror.net/