Good/Bad illustration for UX about thumb placement

This image nails a simple, often-overlooked UX truth: thumb reach matters. On mobile, every inch counts, and putting your key buttons where users actually tap can make or break conversions.

Why this works

• Reduces friction in user flow
• Keeps interaction natural for one-handed use
• Improves speed to action (less frustration, more taps)
• Aligns with Fitts’s Law: easier to reach = higher engagement

Real-life examples

• Instagram’s “heart” button is bottom-center, not top-right.
• TikTok’s actions (like, share, comment) are tucked near the thumb zone.
• Amazon’s “Buy Now” button is huge and always one thumb away.
• YouTube puts key controls along the bottom for easy reach.

Little placement tweaks like this can quietly boost engagement across your app.