Ruby on Rails Creator Declares 'Pencils Down' on Handwritten Code

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1. 2h ago

   Ruby on Rails Creator Declares End of Handwritten Code

   David Heinemeier Hansson, creator of Ruby on Rails, has announced that his software company, 37signals, is abandoning handwritten code. Hansson, also known as DHH, revealed this shift at Rails World 2026, stating that AI agents will now be the primary code producers. This decision marks a significant change in software development practices, with Hansson citing a 1,000x productivity leap thanks to AI.

   Why it matters

   This development signals a major turning point in the software industry, as AI begins to play a more central role in coding. Hansson's company, 37signals, has already seen success with AI-generated code, having rebuilt their HEY app with a Rust backend and producing 150,000 lines of code in August using AI agents. The move away from handwritten code raises questions about the future of software development and the role of human programmers.

   What is confirmed

   • David Heinemeier Hansson, creator of Ruby on Rails, has declared a 'pencils down' policy on handwritten code at his software company, 37signals.
   • Hansson announced this change at Rails World 2026, stating that AI agents will now be the primary code producers.
   • The company has seen significant productivity gains, with 150,000 lines of code produced in August using AI agents.
   • 37signals rebuilt their HEY app with a Rust backend using AI-generated code.
   • Hansson cited a 1,000x productivity leap thanks to AI agents.

   What to watch next

   • The impact of AI-generated code on software quality and maintainability
   • The adoption of AI-driven coding practices by other software companies
   • The response of the developer community to Hansson's 'pencils down' policy
   Sources used for this update (18)

   1. Business Insider — Ruby on Rails Creator Declares 'Pencils Down' on Handwritten Code
   2. heise online — Rust instead of Ruby – Rails founder Hansson’s new project
   3. Startup Fortune — DHH admits AI agents struggled on Basecamp even as they built all of Omarchy
   4. ababnews.com — Rails Founder David Heinemeier Hansson: Handwriting Code Has No Economic Value
   5. The Verge — Ruby on Rails creator: ‘We’re done writing code by hand.’
   6. the-decoder.com — Ruby on Rails creator DHH says he's done writing code by hand
   7. flipboard.com — Ruby on Rails creator declares 'pencils down' on handwritten code
   8. www.businessinsider.com — Ruby on Rails Creator Declares 'Pencils Down' on Handwritten ...
   9. thenyledger.com — Ruby on Rails creator declares 'pencils down' on handwritten ...
   10. the-decoder.com — Ruby on Rails creator DHH says he's done writing code by hand
   11. DevOps.com — DHH Declares End of Hand-Writing Code at Rails World 2026
   12. byteiota.com — DHH Says Pencils Down: End of Hand-Written Code | byteiota
   confidence 95%