Building a proprietary book catalog

Paul Warren is the founder and CEO of Margins, a beautifully-designed reading app that recently won Apple’s App of the Day award and that reached hundreds of thousands of active readers less than a year after it launched. He is a self-described “extreme reader” who reads hundreds of books every year. Prior to Margins, Paul held CTO and Head of Software roles at multiple companies, including Daylight Computer Company, Darvis, and an undisclosed stealth crypto startup. He holds a Bachelor’s degree in computer science from Stanford University.

Key Takeaways:

• As a self-described “extreme reader” who reads hundreds of books per year, Paul founded Margins in 2023 because he wanted a single integrated platform for discovering new books, tracking all of his reading activity, and keeping up with what his friends were reading.
• Before spending any time on app development, Paul invested nearly a year into building their own proprietary book database, which has become a critical competitive advantage.
• Unlike other reading apps like Goodreads that can feel overly transactional, Paul and his team are obsessed over craft, which has led to delightful features like the ability to search for a book based on “vibes,” as well as lots of fun easter eggs.
• In late 2024, just before the holidays, Paul hired a few microinfluencers to create TikTok content that quickly went viral on BookTok. Then in 2025, the same thing organically happened on X. Margins also recently won Apple’s App of the Day award in December 2025. These spikes have contributed to viral word of mouth, helping to organically propel the company to hundreds of thousands of users just a year after launching.
• While Margins doesn’t yet have any premium features, it has managed to convert many enthusiastic subscribers by appealing to their love of reading and asking them to support the app. That being said, Paul and his team have lots of plans to supercharge Margins’ premium product experience over the next year to further accelerate subscriber growth.

Paul Warren:

• Website: https://margins.app/
• LinkedIn: https://www.linkedin.com/in/paulandrewwarren/
• X: https://x.com/paulwarren_

Phil Carter:

• Website: https://www.philgcarter.com
• Substack: https://philgcarter.substack.com
• LinkedIn: https://www.linkedin.com/in/philgcarter
• X: https://x.com/philgcarter

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