What is Napukin?
A mobile-first wireframing program without monthly payments or subscription fees.
Napukin is a browser-based wireframing tool designed for sketching out app screens and UI layouts quickly and at low to medium fidelity. No accounts, no cloud storage, no installs required — just open your browser and go.
The name comes from napukin (ナプキン), the Japanese word for napkin — inspired by those moments when you're out without a laptop and end up sketching wireframes on the nearest napkin.
Who is it for?
- Solo developers who need quick mockups before coding
- Designers on the go who want to capture ideas from a phone or tablet
- Students learning UI/UX design without software costs
- Anyone who needs a simple, fast wireframing tool without the overhead of a full design suite
What can you do with it?
- Draw rectangles, ellipses, lines, arrows, stars, polygons, and triangles with fill, stroke, and corner radius
- Add text with configurable fonts, sizes, weights, and alignment
- Use the pen tool for custom bezier curves and the pencil tool for freehand drawing
- Insert images via file picker, drag-and-drop, or paste
- Rotate, group, align, and distribute layers
- Use comments to annotate your designs
- Undo/redo, snap guides, copy/paste, and keyboard shortcuts
- Export to PNG at 1×, 2×, or 3× resolution
- Export to Figma (.fig format) for further work in a full design tool
How does it work?
Napukin runs entirely in your browser using HTML5 Canvas. Your documents are saved locally in the open-source .npkd file format — a simple ZIP archive containing JSON and image assets.
Install it as a Progressive Web App (PWA) for offline access and a native app feel on any device.