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David Heinemeier Hansson

Endless execution I'm sorry, Dave Sitting down with Senra Wolves, sheep, and gypsies Three sacred cows that must die so Europe can live Dell is on a roll with the XPS The will to power will return But Y European Delusions & Danish Drones The Rape of Britain A pond of interesting problems Let the agents democratize open source Basecamp Five Celebrating computers at Omacon The malleable computer Panther Lake is the real deal Basecamp becomes agent accessible Denmark desperately needs more inequality ONCE (Again) Omacon comes to New York Clankers with claws Cloud gaming is kinda amazing Promoting AI agents Europe is weak and delusional (but not doomed) Fizzy is our fun, modern take on Kanban (and we made it open source!) Six billion reasons to cheer for Shopify Local LLMs are how nerds now justify a big computer they don't need No backup, no cry Sabbaticals keep our attrition at bay Success always spawns haters
The O'Saasy License
David Heinem · 2025-12-17 · via David Heinemeier Hansson

David Heinemeier Hansson

December 16, 2025

One of my favorite parts of the early web was how easy it was to see how the front-end was built. Before View Source was ruined by minification, transpiling, and bundling, you really could just right-click on any web page and learn how it was all done. It was glorious.

But even back then, this only ever applied to the front-end. At least with commercial applications, the back-end was always kept proprietary. So learning how to write great web applications still meant piecing together lessons from books, tutorials, and hello-world-style code examples, not from production-grade commercial software.

The O'Saasy License seeks to remedy that. It's basically the do-whatever-you-want MIT license, but with the commercial rights to run the software as a service (SaaS) reserved for the copyright holder, thus encouraging more code to be open source while allowing the original creators to see a return on their investment.

We need more production-grade code to teach juniors and LLMs alike. A view source that extends to the back-end along with the open source invitation to fix bugs, propose features, and run the system yourself for free (if your data requirements or interests maks that a sensible choice over SaaS).

This is what we're doing with Fizzy, but now we've also given the O'Saasy License a home to call its own at osaasy.dev. The license is yours to download and apply to any project where it makes sense. I hope to read a lot more production-grade SaaS code as a result!

osassy-license.png

About David Heinemeier Hansson