Sketchize is a free set of printable wireframe sheets (PDFs formatted for A3/A4 paper with pre-drawn phone, tablet, and browser frames plus grid guides), for sketching layouts by hand before touching a screen.
Paper sketching forces faster, lower-commitment iteration than any digital tool: you can throw away five bad layouts in the time it takes to open a file, and the pre-printed device frames save you from freehand-drawing a phone outline over and over.
Best for the very first pass of an idea, in a workshop or solo brainstorm, before anything goes near Figma: not a replacement for digital wireframing, a complement to it.
It's a static download, not a tool: there's no digital version, syncing, or sharing beyond scanning or photographing what you sketch.
A free wireframing kit with printable device sketch sheets.