What it does
Laws of UX is Jon Yablonski’s illustrated reference to psychology principles used in interface design. Topics such as Fitts’s Law, cognitive load and the peak-end rule have short explanations, practical takeaways and further reading. The reference is free, with downloadable posters and separately sold products.
Choose a principle from the homepage to read its definition, takeaways and origins. The Fitts’s Law page, for example, connects target size and distance to the effort of selecting a control. Its takeaways address touch-target size, spacing and placement, followed by links to more detailed articles and research.
The format works well when you need a concise explanation for a design discussion or want a starting point for deeper study. Related principles appear below each entry. Language controls offer English, Spanish, French, Arabic and Persian, and the site includes light and dark display options.
Reading requires no account. Individual entries link to Download free poster, while large-format posters are sold separately. The Info page identifies the site content and posters as Creative Commons Attribution-NonCommercial-NoDerivatives 4.0, so free access does not permit unrestricted commercial reuse or altered redistribution.
Strengths
- Short takeaways connect each principle to interface decisions
- Entries include origins and links for further reading
- Free poster downloads accompany the reference pages
Watch out for
- The content licence restricts commercial reuse and derivative distribution
- Entries are concise introductions rather than full research papers
Best for
- Designers explaining interface decisions to colleagues
- Students learning psychology concepts used in UX
Sources
- Laws of UX home (Oct 27, 2026)
- Fitts’s Law: takeaways and origins (Oct 27, 2026)
- About Laws of UX and its content licence (Oct 27, 2026)