Free guides

UX psychology, in guides you can keep

Free guides from Science of Apps for product designers, PMs and founders. Each one turns behavioral science into something you can use on your own screens: downloadable field guides and in-depth studies you can read online, like our analysis of 100 app paywalls.

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Free AI skill · step 1 of 2

Tune your paywall skill

Six quick taps. Your skill is built from the playbook of 100 top paywalls and tuned to your answers, for Claude, ChatGPT, Gemini or any AI tool.

What do you want your paywall to do better?The skill puts this goal first in every answer.
What kind of app is it?
Where does it run?
What do you sell?
Where are you right now?
Which AI tool will you use it in?We'll send the right install steps.
Free PDF · 74 pages · 2 editions

The Laws of UX, in one field guide

60 research-backed principles in 6 categories — what each one means, why it works on the human brain and how to use it on your own screens. Written by Sushant Singh, founder of Science of Apps, who has scaled consumer apps to lacs of users and spent 10+ years leading product across startups and digital businesses in the US, EU & India.

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Free. No card, no paywall — just your email.
Free PDF · 74 pages

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Free PDF · 90 pages · 2 editions

100+ Subscription Paywalls, decoded

110 real paywalls from top apps, taken apart, rated out of 5 and decoded with the Laws of UX — plus the frameworks, copy and checklists to ship your own. By Sushant Singh, founder of Science of Apps.

  • 110 paywalls rated
  • 34 Laws of UX
  • 12 frameworks

Which paywall scored 4.8 out of 5, and which scored 2.6? It’s all inside.

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Free. No card, no paywall — just your email.
Free PDF · 90 pages

Get 100+ Paywalls, Decoded by email

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You’ll also get occasional UX psychology tips. Unsubscribe anytime. Privacy policy