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Leanpub Author Testimonials

What authors have had to say about Leanpub, on camera and in their own words.

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Every testimonial here is a passage from a Leanpub Launch video or Leanpub Podcast interview where an author volunteered something about publishing with Leanpub. The words are extracted by AI tooling with an instruction to be verbatim, and each one links to the moment in the interview it was said.

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My Book Auto-Updates Daily by Tracking Source Code, Reddit & YouTube

Daniel Vaughan, author of Codex CLI: Agentic Engineering from First Principles
“So the book is really all written by Codex, with my review and with my direction on what topics to cover. It's automatically updated every day. … It's keeping track of the source code for Codex, the release notes, the documentation on OpenAI, what people are talking about on Reddit, what people have published on videos on YouTube. And it's checking — it checks that it's up to date and says, oh, there's this new feature that's come out, or this new paper that's come out. How does that affect the book? Do I need to make changes to the book? And every day it sends me a plan for updating the book, which I review and then tell it what to update, and it updates the book and then I review it. And then I can just republish the book every day and keep it up to date.”

From Daniel Vaughan's Leanpub Podcast recorded 2026-05-02 — watch this moment at 45:20 on YouTube.