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

UX analysis
Collections

Growth Hacking

Free
8 min to learn...

Monzo Nailed the Start of The Savings Challenge (But Not the Middle)

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Growth Hacking

An analysis of Monzo’s 1p challenge, focusing on the middle slump, where progress slows and motivation quietly fades.

Skills you'll build
  • Delight can replace progress, but only temporarily

  • "The middle" is the real retention problem

  • Motivation needs contextualised reference points

Case StudyJan 14, 2026
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BFM+Exclusive
10 min to learn...

Why You’re Addicted to Lovable Before You Even Hit the Paywall

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Growth Hacking

Lovable is addictive and enjoyable to use. Here's how they hook new users in the first 5-minutes of usage, and convert them into paid customers.

Skills you'll build
  • How Lovable is similar to a slot machine

  • The psychological loops that drive habit and retention

  • How to time paywalls to be more effective

Case StudyOct 14, 2025
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BFM+Exclusive
8 min to learn...

How Substack uses Deceptive Design to Fuel Growth

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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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BFM+Exclusive
9 min to learn...

Is This Why Users Are Ignoring Your Features?

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Product Psychology

Simple techniques to increase feature usage, retention and ultimately alter how users perceive the value of your product.

Skills you'll build
  • Reframing features to improve perceived value

  • Using context to boost feature retention

  • Designing perk flows that reduce churn, not just noise

Case StudyJul 4, 2024
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7 min to learn...

Why Robinhood's $7.08 Welcome Bonus Works

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Product Psychology

The product psychology behind why theirs works, and why yours probably doesn't. Here are the secrets of the welcome bonus.

Skills you'll build
  • Using variable rewards to drive conversions

  • Designing choice to increase perceived ownership

  • Closing feedback loops to build user habits

Case StudyMay 2, 2024
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BFM+Exclusive
9 min to learn...

How (not) to get people to download your app

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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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BFM+Exclusive
10 min to learn...

Understanding the growth engine of Threads

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Growth Hacking

A deep dive into why Threads' launch strategy was so effective, and the UX theory behind their A/B tests.

Case StudyJul 19, 2023
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