A Month Exploring Fizzy - In their book Getting Real, 37signals talk about Open Doors — the idea that you should give customers access to their data through RSS feeds and APIs. Let them get their information when they want it, how they want it. Open up and good things happen.

Fizzy takes that seriously. When 37signals released Fizzy with its full git history available, they didn’t just open-source the code — they shipped a complete API and webhook system too. The doors were wide open baby!

So I dove in — reading the source, building tools, and sharing what I found. Every time curiosity kicked in, there was a direct path from “I wonder if…” to something I could actually try and execute. This post is a catch-all for my very bubbly month of December.

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The Making of Fizzy, Told by Git - Today Fizzy was released and the entire source code of its development history is open for anyone to see. DHH announced on X that the full git history is available - a rare opportunity to peek behind the curtain of how a 37signals product comes together.

I cloned down the repository and prompted Claude Code:

“Can you go through the entire git history and write a documentary about the development of this application. What date the first commit was. Any major tweaks, changes and decisions and experiments. You can take multiple passes and use sub-agents to build up a picture. Make sure to cite commits for any interesting things. If there is anything dramatic then make sure to see if you can figure out decision making. Summarize at the end but the story should go into STORY.md”

It responded with:

“This is a fascinating task! Let me create a comprehensive investigation plan and use multiple agents to build up a complete picture of this project’s history.”

Here is the story of Fizzy - as interpreted by Claude - from the trail of git commits. Enjoy!

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