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Built for Mars Ltd is a company registered in England and Wales (Company No. 12731987).

  • Case Studies
    UX Case Studies

    Impactful UX lessons and techniques, crafted into 86 digestible stories.

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  • UX Bites
    UX Bites

    Find the best UX ideas, trends and innovations, at warp speed.

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    Cheatsheets

    Guides on specific topics, using real examples to help you copy like a pro.

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  • Psychology
    UX Psychology

    Learn how to effectively use product psychology in your designs.

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UX analysis
Collections

Teardowns

BFM+Exclusive
8 min to learn...

How Substack uses Deceptive Design to Fuel Growth

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Substack
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Teardowns

Substack is optimised for writers, not readers. They use deceptive design and psychological exploits to drive growth.

Skills you'll build
  • How Substack uses deceptive design to boost sign-ups

  • How they exploit uncertainty to drive upgrades

  • The risks of careless A/B testing

Case StudyJun 12, 2025
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11 min to learn...

The Complexity Paradox of ChatGPT, AI and UX

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ChatGPT
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Teardowns

As the underlying technology improves, interfaces like ChatGPT get harder to use. Does this explain the strategy for Apple Intelligence?

Skills you'll build
  • Making complex tools feel simple to use

  • Helping users understand what AI can (and can’t) do

  • Fixing broken expectations before they cause confusion

Case StudySep 19, 2024
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10 min to learn...

The Psychological Reason You Hate Chatbots

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Product Psychology

They aren't exactly the future of customer service that we were promised. This is why you hate them though.

Skills you'll build
  • Reducing friction by setting clearer expectations

  • Avoiding ambiguity the that hurts conversions

  • Designing handoffs that feel comfortable

Case StudyMar 26, 2024
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9 min to learn...

How (not) to get people to download your app

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Reddit
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Teardowns

Reddit's strategy of canibalising their own web experience, and blocking third party apps, might not be working.

Case StudyAug 30, 2023
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12 min to learn...

Product Builders: Don't Copy Ticketmaster

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Teardowns

Behind the growing ticket sales and returning user base, lies a troubled experience with fundamental problems.

Case StudyMay 23, 2023
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8 min to learn...

HBO's Beautiful Design Is Also Terrible UX

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HBO Max suffers from poor UX judgement, a lack of finesse and a focus on style over function. Let's learn from their mistakes.

Case StudySep 5, 2022
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8 min to learn...

This is Why Your Uber Eats Driver Got Lost

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Uber
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Teardowns

I joined 4 million others, and became an actual Uber Driver, and the UX is surprisingly awkward.

Case StudyJan 6, 2022
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