Sign in

Behavioural psychology for product teams

Design with psychology. Use it responsibly.

Turn product friction into a clearer design decision with evidence-informed psychology, real interface examples and practical ethical guardrails.

Try the Decision LabExplore ingredients
105
psychology ingredients
415
checked research sources
13
product case studies

Start with the job in front of you

What do you need help with?

Choose by task. You do not need to know the psychology term first.

01

Make a product decision

Describe the problem and compare responsible approaches.Open Decision Lab →02

Understand a behaviour

Learn what may be happening, where it applies and where it can fail.Browse ingredients →03

Find a relevant UI example

Search real screens by task, context, product or principle.Explore UI examples →04

Study a complete journey

Follow the psychology through real product flows, screen by screen.Read case studies →

The ingredient library

Learn the principle.
Keep the limitations.

Browse all 105 behavioural principles, biases and effects in one dedicated library. Search in plain language, see checked sources, and understand both the possible benefit and the risk before applying an idea.

  • Plain-language explanations
  • 415 checked research sources
  • Practical uses, limits and ethical cautions
Explore all ingredients

Psychology in the wild

Real products. Screen by screen.

Go beyond theory with annotated journeys showing where psychology helps, where it hinders, and what could be improved.

View all case studies
04

Designed for responsible influence

Persuasion is a material. Ethics is part of the craft.

The UXologist treats every psychology pattern as a trade-off—not a growth hack. Recommendations state what each ingredient may contribute, where it can fail and which guardrails to monitor.

Read our evidence and editorial method

Build your product toolkit

Make the next decision with more than instinct.

Start a free account to save ingredients, create decision briefs and return to your work.

Create or access your accountSee membership