Scribbler - JavaScript Notebook Tool for experimenting in JavaScript. Runs in the browser without a backend. Discord server: https://discord.gg/uxNSsWunwU
How about Monokai or similar dark mode themes not only for dark mode but for the light mode too, with a toggle options and simple state transitions animations in css.
The app is looking ok in light mode, but in dark mode each cell has white border. it is not looking very clean. needs fixing.