Artist Proportion Tool

D.Yago

About this app

Artist Proportion Tool is a digital version of the classic "pencil held at arm's length" technique. Load a reference photo, draw measurement lines across features, and instantly see how they compare — no guesswork needed.

HOW IT WORKS

Take a photo or pick one from your gallery
Drag to place a measurement line across any feature (head height, arm length, etc.)
Add a second line and see the proportion instantly
Set a canvas scale — tell the app "this line is 2 inches on my canvas" and every other line shows its real size
BUILT FOR ARTISTS

Whether you're working on portraiture, figure drawing, or still life, accurate proportions are the foundation of a convincing piece. This tool lets you check ratios quickly so you can focus on creating.

FEATURES

• Draw up to 8 color-coded measurement lines per image
• Instant plain-language ratio comparison
• Canvas scale calculator — converts proportions to real measurements (inches, cm, or mm)
• Drag endpoints to adjust lines after placement
• Pinch to zoom and pan for precision on detailed areas
• Full undo support
• Works completely offline
• No ads, no accounts, no data collection

What’s new

Initial prod release