Design with more ownership.

Proof of Concept is David Hoang's weekly newsletter about design, technology, and building things. This is where members read every issue, work through the guides, and use the resources.

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  • A hand-drawn process moving from notes and experiments to a book and a finished digital product.
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What's in the member library

This is the paid member site—not the public newsletter page. Everything below is in your library with a subscription.

  1. Newsletter archive

    Every issue in one list you can search by title, issue number, or subtitle, with the full article a click away.

  2. Guides

    Walkthroughs of how David actually works, including Obsidian for writing and Replit for shipping small software.

  3. Resources

    The tools and recommendations he relies on, including member offers when a partner provides one.

Recent issues

  1. Issue 320 Oct 18, 2026

    Learn to ship

    Coding the software is the smallest part of shipping

    Read issue
  2. Issue 319 Oct 11, 2026

    The Research Builder

    AI makes building cheaper. It makes research more important.

    Read issue
  3. Issue 318 Oct 4, 2026

    How I work

    Understanding the conditions for you to be effective

    Read issue

Pick up where you left off.

One sign-in opens the archive, the guides, and the resources.

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