Preparing tool
How to use Thumb Zone Simulator
- Add a phone screenshot, or try the sample.
- Choose right, left or both thumbs and the phone size.
- Click a button to see how easy it is to reach and compare it with a 9 mm target, then export.
What are the limits of Thumb Zone Simulator?
Zones follow published thumb-reach studies; hands and grips vary, so treat them as a guide. The image stays on your device.