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Vol. II — No. 184Remarkable People · Exceptional CompaniesToday's Edition

reactive-programming

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Company
Observable and the case for showing your work
Developer Tools · Saas · Enterprise

Observable and the case for showing your work

A chart can settle an argument. Observable would rather let you inspect it: the data, the code, the assumptions, and now the AI that helped put it together.

data-visualization · collaborative-notebooksRead →
Company
marimo
Developer Tools · Ai · Saas

marimo

marimo is a San Francisco company building an open-source reactive Python notebook that replaces the error-prone JSON of Jupyter with pure Python files. Cells form a dataflow graph, so changing one variable automatically re-runs the cells that depend on it - notebooks are reproducible, git-friendly, deployable as apps, executable as scripts, and can even run entirely in the browser via WebAssembly. Founded in 2022 by Akshay Agrawal and Myles Scolnick, marimo raised a $5M seed in 2024 and joined CoreWeave in October 2025 while keeping the notebook free and permissively licensed.

reactive-python-notebook · pythonRead →