Design

I want to make some quick designs for a mini-app. I have a rough idea of how I want my design to function.

But I don't know where and how to start with the design, is there an app or tool that can let me quickly draft out/imagine a design and let me edit it on the fly?

Try https://www.figma.com/figjam/ or https://excalidraw.com/

Been using Figjam for whiteboarding! Just having a bit of a hard time trying to make the jump from whiteboard/ wireframe into designs that I think would fit the app. I'll give it a try, thanks!

In that case I would suggest against going into detail on Figma (or whatever else), just use Figjam to sanity check the flows for missing parts, then just ship it. you can refine design when you have users

good call, I'll go with that route. Thanks Antimo!