What is the Thumb Zone, and how do you design phones for comfortable one-handed use?

Short answer

It is the natural area users can reach with their thumb easily without changing their grip or using the other hand. It is divided into natural, stretch, and hard-to-reach zones.

Explanation

Steven Hoober's research found that more than 49% of people hold phones in one hand and depend entirely on their thumb. As modern phones get larger, the top corners have become difficult areas that require more effort. Comfortable design places primary action buttons, search fields, navigation bars, and bottom menus in the lower half of the screen (the easy natural zone).

Common mistakes

• Placing the primary Save or Continue button at the phone's far upper-right or upper-left corner.
• Forcing users to stretch their fingers upward on every screen to complete routine, repeated actions.

Follow-up questions

• What is Fitts's Law, and how does it affect button design and touch interaction on phones?

Sources

• Nielsen Norman Group — Mobile Thumb Zone and One-Handed Ergonomics