Angle · 8 Pro
An on-screen protractor for your Mac.
Swing two arms from a vertex to measure any angle on your screen — from 0° to 180° — along with the reflex angle and the direction of each arm.
Free to download · Requires macOS 15 or later
What it measures
- The angle between two lines, from 0° to 180°
- The reflex angle
- The direction of each arm, counter-clockwise from horizontal
- Slopes, rotations and skewed elements
How to measure an angle on the screen
Choose the angle tool
Press ⌃⌥M, then 8. Or hold ⌘ and drag to draw a new angle.
Place the vertex
Drag the rivet onto the point where the two lines meet.
Swing the arms
Drag each arm’s grip along one of the lines; hold ⇧ for 15° steps. Read the angle, and press ⌘C to copy it, like “45°”.
Keyboard shortcuts
- 8
- Choose the angle tool
- ⇧drag
- Snap an arm to 15° steps
- []
- Rotate both arms
- ⌥←→
- Change the arm length
- ⌘C
- Copy the angle
Free or Pro?
The Angle is part of Measure My Pro, a one-time purchase. Before you buy, it opens once for a full session, so you can try it on your own work.
Enhanced Precision — edge snapping, gap detection and a real-pixel loupe — is free and optional. It needs Screen Recording permission; everything else works without it.
Questions and answers
How do I measure an angle on my Mac screen?
Use Measure My’s angle tool — an on-screen protractor. Put its rivet on the vertex and swing each arm along a line; the readout shows the angle in degrees.
Does it show the reflex angle?
Yes. Next to the angle itself, the readout gives the reflex angle and the direction of each arm.
The other instruments
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Measure what you see.
A precision instrument for your screen — one shortcut away.