Show HN: Sabela – A Reactive Notebook for Haskell

A new project called Sabela just strutted onto Hacker News with a gallery of browser-friendly notebooks, and the vibe was instant “okay, this is actually pretty slick”. For anyone not living deep inside programming forums, a notebook is basically a document where code, text, and results live together on one page. Sabela’s pitch is that it makes those pages reactive, meaning they can update as things change, and the demo gallery goes all in: 3D shapes, housing data, animations, tutorials, and even a notebook that mixes Haskell with Python.

But in classic internet fashion, the biggest burst of community energy didn’t come from a grand philosophy debate—it came from one laser-focused question. User m1rsh0 swooped in with the most relatable reaction possible: what’s powering the plots? That tiny comment says a lot about the mood. People weren’t rolling their eyes or picking a fight; they were already peeking under the hood, trying to figure out whether this shiny new tool could actually do the practical stuff they care about.

So yes, the launch itself is polished, but the real drama is delightfully nerdy: the crowd wants receipts. Not “wow, amazing” receipts—chart receipts. In a sea of notebooks that promise everything, Sabela seems to have triggered the curious, skeptical kind of excitement: if this thing can make Haskell feel visual, shareable, and easy to run in a browser, commenters are ready to poke it, test it, and absolutely interrogate its plotting setup.