Tracing paper for your whole screen

Draw on top of anything

Press ⌃⌥E and your screen becomes a canvas. Pen, line, arrow, rectangle, ellipse and text, in any color and width. Grab a shape right after you draw it, and undo up to 100 steps.

• ⌃⌥E Start or stop editing
• ⌘Z Undo

Then click straight through it

Leave edit mode and your drawings stay exactly where you put them, on every Space and over full-screen apps, while every click reaches the app underneath. Hold ⌥ whenever you want to draw again for a moment.

• Esc Back to click-through
• ⌃⌥Space Hide or show the canvas

Lay a grid and rulers over any app

A pixel-aligned grid with the spacing you choose, and rulers along the top and left edges that follow your pointer. Read positions in points, pixels or percent.

• ⌃⌥R Rulers
• ⌃⌥G Grid

Measure what is actually on screen

Press ⌃⌥M and drag between two points to read the distance, Δx, Δy and angle. Hold ⇧ to measure a rectangle instead. Hold ⌘ as you let go to pin the result to the canvas.

• ⌃⌥M Quick measure

Zoom in until you can count pixels

The magnifier follows your pointer and shows every pixel with hard edges, never blurred. 2× to 8× is free. Pro goes up to 32× and reads the color of the center pixel.

• ⌃⌥Z Magnifier
• ⌃⌥= ⌃⌥- Zoom

The magnifier needs Screen Recording permission. Frames are processed on your Mac and never saved.

Point things out while you present Pro

With Auto-Fade, whatever you draw lingers for a few seconds and then disappears on its own. Click Effects show a ripple wherever you click, in any app, so viewers can follow along.

• ⌃⌥F Auto-Fade