GoodUI
75 UI ideas and 141 patterns backed by 639 replicated A/B tests
GoodUI is Jakub Linowski's library of conversion-oriented UI ideas, each tied to real A/B test evidence instead of opinion. The free layer gives you 75 numbered ideas and the list of 141 patterns grouped by screen (Home & Landing, Content, Product, Checkout, Listing, Thank You, Shopping Cart, Signup, Pricing, Global) and by tag (Form, Headline, Pricing, Popup, Personalization, Layout, Button, Photos, Copy, Interaction, Social Proof). The measured effect sizes, the 639-test database and the 'Leaks' section of spotted experiments sit behind a paid membership. It is for product and growth people who need a defensible reason for a UI decision.
Reach for GoodUI when you must justify a conversion-affecting change (button copy, form length, pricing layout, popup timing) and 'best practice' is not enough — the free idea pages are plain readable HTML and cite direction of effect. Do not promise a user a specific lift percentage from it: the numbers are paywalled at $60-72/mo per seat and you will only see 'Join to see effect'. Pair it with uxpatterns.dev, which gives the accessible implementation GoodUI never covers.
Why it is here. It is the only widely-known UI reference that ties each recommendation to replicated experiment data rather than taste, which makes it the sane counterweight to inspiration galleries.
- 75 numbered UI ideas
- 639 replicated A/B tests
- evidence-ranked patterns
- 'Leaks' of spotted live experiments
Verified 2026-08-16. HTTP 200. https://goodui.org, https://goodui.org/patterns/, https://goodui.org/join/
