1 of 451
Inversion
Carl Jacobi / Charlie Munger
Solve problems backwards. Ask how to fail, then avoid it.
You were going to scroll anyway.
So scroll something that stays with you. 451 mental models and primary sources, one per swipe, explained in layers — and brought back just before you'd forget them.
Not ready to install? Read eight ideas here first.
DoomscholarScroll it
Read the idea
2 of 451
Compounding
Albert Einstein (attrib.)
Small advantages, repeated, become enormous.
3 of 451
Hanlon's Razor
Robert J. Hanlon
Never attribute to malice what is adequately explained by carelessness.
4 of 451
Second-Order Thinking
Howard Marks
First-level thinking says 'and then what?' once. Second-level thinking keeps asking.
5 of 451
Lindy Effect
Nassim Taleb
The longer an idea or object has survived, the longer it is likely to keep surviving.
Read here. Remember in the app.
In your browser
- A taste of the Scroll — eight ideas
- Every idea page, in full, with its sources
- A quiz on each idea
In the app
- The whole Scroll, tuned to your interests
- Review that brings each idea back on schedule
- A quiet daily reminder when ideas are due
- Listening with the screen locked
- Everything offline
Why reading isn't enough
Most of what you read is gone within a week. The app asks you about each idea again just as it starts to fade — a few seconds each time, spaced further apart as it sticks.
- 1day
- 3days
- 7days
- 16days
- 35days
Pick a thread
- Meaning & Self 90
- Cognitive Biases & Models 79
- Decision-Making 74
- First-Principles Thinking 69
- Craft & Deep Work 58
- Power & Persuasion 54
- Tech Adoption & Disruption 49
- Markets & Narrative 47
- Incentives & Systems 46
- AI & the Future 46
- Moats & Network Effects 37
- Startups & Founders 25
- Compounding & Patience 25
- Wealth, Leverage & Judgment 24
- Macro & Cycles 23
- Risk & Asymmetric Bets 16
- Health & Body 14
- Social Constructs 14
- Fraud & Skepticism 13
- Crypto & Trust 10
- Philosophy & the Self 10
Or browse all 451 ideas, A to Z.
Questions
- Is it free?
- Yes, during the beta. No ads, ever.
- Do I need an account?
- No. Your progress stays on your phone, and nothing you write leaves it. Privacy policy.
- Where do the explanations come from?
- They're written with AI assistance from the original books, letters and essays, and every idea links to those sources so you can check them.