Growth.Design

53 product UX case studies as comics, plus 106 psychology principles

Tier B · UsefulArticleCourseReferencegrowth.design

Growth.Design publishes teardowns of real products (Amazon, Netflix, Adobe, Apple, Duolingo and others) as illustrated slide-by-slide comics that take five to ten minutes each, currently 53 case studies. Alongside them sits a library of 106 cognitive biases and psychology principles grouped into Information, Meaning, Time and Memory, with a free cheat sheet download. It is run by Dan Benoni and Louis-Xavier Lavallee and monetised through a free email subscription plus paid product-psychology masterclasses. The audience is product designers and PMs who want the behavioural 'why' behind an interface decision.

For an agent

Use the /psychology index, not the case studies, when you need a named principle to justify an onboarding, paywall or activation decision — it is 106 entries of plain text and it fetches cleanly. The case studies themselves are image comics behind a free-signup gate, but each page ships a 'Text version' transcript inside the HTML, so curl the case-study URL and read that rather than trying to describe the pictures. Cite it as behavioural reasoning, never as measured evidence — for numbers use GoodUI instead.

Why it is here. It made behavioural psychology legible to product teams, and the 106-principle index is the most usable free mapping of cognitive biases onto concrete interface decisions.

Install command, framework, licence and component list.

Facts

License: Proprietary / all rights reserved
Pricing: Freemium, Free but account required, Paid
Framework: Not applicable
Styling: Not applicable
Distribution: Web app / online tool, Article, thread, or post
Platform: Web
Content type: Images / textures / backgrounds, Prose / writing, Screenshots / screens
Agent readiness: Pixels only, Login required
Accessibility: Unknown
Maturity: Actively maintained
Pricing detail: Case studies and the psychology library are free with an email or Google signup; some entries are marked 'Premium Psychology'. Paid masterclasses are sold at /courses/product-psychology (price not shown without signup).

Helps you build

Onboarding Web App Onboarding Mobile Paywall Checkout Sign Up Canceling Subscription Referral Flow

Notable for

comic-format product teardowns
106 psychology principles in four groups
free cognitive-bias cheat sheet
text transcript embedded in each case study

Provenance

Verified 2026-08-16. HTTP 200. https://growth.design, https://growth.design/case-studies, https://growth.design/psychology, https://growth.design/case-studies/amazon-purchase-ux

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growth.designTier B