Shipping features is easy. Understanding your user's behaviour isn't.
Built for Mars explains what real products do, and the psychology of why it works. It's for designers, PMs, engineers and anyone else who builds the product.
Trusted by 40,000+ design & product professionals
The best library of content
Organised to help you learn
Ideas for every part of your product, whether you're looking for them or not.
Every example is tagged by the problem it solves, so 'my users are dropping off at account creation' becomes a search, not a hunch.
Whatever you're fixing this month, someone's already fixed it somewhere else.
- Browse by topics, impacts, psychology and more
- Create custom Pathways on the problem
- Browse solutions from real, shipped products
You didn't know you needed the idea. That's why you weren't looking for it.
- Research straight to your inbox
- Across countries and industries you'd never check
- Covering all aspects of your product
One good example turns a hunch into something you can defend.
- If you can’t point to a real product that did it, it’s an opinion
- Explain exactly why something feels good
- Contextualise design choices with business impacts
Available inside Claude, Cursor and Figma.
Prettier screens are easy to generate. Defensible ones need evidence. Built for Mars works for humans and agents, inside the tools your engineer uses.
Ask about your onboarding and it answers with real examples.
- Add it to Claude as a connector
- Answers from nearly 100 case studies and 1,500+ UX Bites
- When there’s a gap, it names the case study to read next
It’s like giving Cursor a colleague who’s read every case study.
- Connect via MCP, in Cursor or Claude Code
- Checks real examples before it builds
- Every answer cites its source
Other plugins polish the screen. This one explains why people leave it.
- Available via Figma's MCP, or a native Figma plugin
- Analyse any frame, component or design
- Get sources directly from inside your file
Learn what great looks like, then copy it
1,500+ bitesized ideas, all categorised and contextualised with product psychology. You can even receive alerts when your competitors next ship some UX magic.
Nir Eyal (Hooked)
An exceptional resource for learning how to build habit-forming products that people love.
Bing Gordon (Kleiner Perkins & EA)
The completest view of the psychological underpinnings of human behaviour that I’ve ever seen.
Steve Krug (Don't Make Me Think)
I’d never met anybody who looks at usability and UX the way I do until I met Peter. Only he’s smarter.
DHH (Hey! & Basecamp)
What a nice idea! Christopher Alexander would be proud to see patterns collected like this.
One example turns a hunch into something you can defend.
Every team has that person who says "users won't mind". This is for the person who does. If you've read this far down the page, that's you.
Trusted by designers, engineers and product managers at
Trusted advice
Techniques and ideas that have already been tested and shipped
That isn't boring
Most UX content is dry and boring, this is different