Read what they read. With the receipts.

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An example of a receipt:

SourcedInterview, post or talk · date

Each book carries a receipt: where they said it, and when.

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Book of the day · 7 Nov 2026

The Hard Thing About Hard Things

Ben Horowitz

Rating 4.6 · 2014 · 304 pages

Ben Horowitz, co-founder of Andreessen Horowitz and one of Silicon Valley's most respected and experienced entrepreneurs, offers essential advice on building and running a successful startup in The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers . Many people may talk about how great it is to start a business—but very few are honest about how difficult it is to run one. Horowitz provides an inside view of the pitfalls every leader must face, sharing the insights he’s gained developing, managing, selling, buying, investing in, controlling, and supervising technology companies. A lifelong rap fanatic—he even teaches brand strategy at Stanford's design school—Horowitz amplifies business lessons with lyrics from his favorite songs and tells it straight about everything from firing friends to poaching competitors. He also shows how he cultivated and sustained a CEO mentality while leading Loudcloud during the Internet boom.

Recommended by Peter Attia

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How the receipts work

Every book gets one of three labels. The label is the rule, not an opinion.

SourcedInterview, post or talk · date

A link to the person's own words — an interview, post, talk, newsletter or book — naming the book, with the date they said it.

ReportedNamed publication · date

A named third party reports the recommendation, and we link that report rather than the original.

UnconfirmedWe couldn't find where they said this

No traceable source yet, or the sources disagree with each other.

The labels above are examples. Grading is editorial work in progress, so no book on the site carries one yet.