marimo

What is marimo?

Reactive, Git-friendly Python notebooks.

Who is marimo best for?

marimo is best for Python data scientists and analysts who want reproducible notebooks saved as plain Python files.

• Teams tired of notebook state bugs

  Running a cell reruns every cell that depends on it, and deleting a cell removes its variables, so there is no hidden state.

• Notebooks under version control

  Each notebook is a .py file that diffs cleanly in Git, imports as a module, runs as a script and can be tested with pytest.

• Data apps and dashboards

  Built-in sliders, dropdowns, tables and plots turn a notebook into an app that you serve from the CLI or export as WebAssembly HTML.

• SQL and dataframe work

  SQL cells query Polars, Pandas, DuckDB, SQLite, Postgres, MySQL and other backends next to Python code.

How much does marimo cost?

marimo is free and open source, with no paid tier, and its hosted molab notebooks are free too as long as usage stays reasonable.

marimo has no pricing page, paid plan or payment step: you install it with pip and run it locally, or use the hosted molab workspace. Its FAQ answers the question of cost with a plain yes, it is free. Full pricing on docs.marimo.io. We checked these prices on 28 Sep 2026.

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Is marimo open source?

Yes. marimo's code is public under the Apache 2.0 licence, so you can read it, change it and run it yourself.

What are the best marimo alternatives?

marimo is an open source alternative to DataLab.

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Questions about marimo