Mockdown is a free, browser-based ASCII wireframe editor. No install, no account, no cost.
It lets you drag and drop components to build UI mockups, low-fidelity prototypes, and text diagrams entirely in ASCII. That means your designs are plain text, portable everywhere, and renderable in any terminal, doc, or code comment.
The case for reading further: ASCII wireframes sidestep the bloat of Figma for early-stage work, and a browser-based drag-and-drop approach lowers the barrier to a format most designers ignore. Worth seeing how far the component library actually goes.
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