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By the Book

By the Book

The books which inspired the world's most successful people

Entertainment·Launched Dec 2016·0 upvotes·sage.co.uk

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UNVERIFIEDlast checked Jul 14, 2026 · HTTP 403

CohortClass of 2016

What it is

The books which inspired the world's most successful people. [Productivity, Books]

HTTP liveness

11 probes since Jun 16

Jun 16Jul 14

AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)

Observed events

probes · press · GitHub

Jun 17, 2026
Probe inconclusive
Cloudflare block
Jun 16, 2026
First probe — redirected
Redirected offsite

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Tags

consumers students researchers

Pulse Indexobserved activity

152/4 signal families

Liveness40%

0.20

Press30%

no data

GitHub20%

no data

Tranco10%

0.71

Weighted observed activity · updated Jul 15

Cohort survival · Class of 2016weekly

13,657 products launched in 2016 · 100% still active

13,633 active24 sunset

Still active

100%

Median lifespan

4.9y