What is Marimo used for?

marimo is a reactive Python notebook stored as plain .py files that runs as a script or deploys as an interactive app. It is a good fit for reproducible data analysis in Python and turning notebooks into shareable apps.

Is Marimo open source?

Yes. Marimo is open source under the Apache-2.0 licence. Its source code is on GitHub at marimo-team/marimo and is written mainly in Python.

Yes. Marimo is open source, so the software itself is free to use. A managed cloud version is also available.

What is Marimo an alternative to?

Marimo is an open-source alternative to Hex and DataSpell. Other open-source alternatives to Hex include Jupyter Notebook and JupyterLab.

Is Marimo actively maintained?

Yes. The most recent commit to Marimo was on 2 October 2026, and the latest release is 0.25.1, published on 1 October 2026. The project has 23k stars on GitHub.

Marimo: open-source alternative to Hex, DataSpell

About Marimo

marimo is a reactive Python notebook. Running a cell, or changing a UI element, makes it automatically re-run dependent cells or mark them as stale, so code and outputs stay consistent. Notebooks are saved as pure Python with first-class SQL support, which makes them friendly to git, executable as scripts and deployable as apps. It is released under the Apache-2.0 license.

The project presents itself as a replacement for tools like Jupyter, Streamlit, Jupytext, ipywidgets and Papermill. Highlights include binding sliders, tables and plots to Python without callbacks, querying dataframes, databases and warehouses with SQL, reproducibility with no hidden state and built-in package management, parameterized script execution, sharing as web apps or slides that can run in the browser via WASM, importing functions between notebooks and running pytest on notebooks. The editor has AI assistants and vim keybindings, and works alongside VS Code, Cursor, PyCharm and other editors. A free online notebook is available.

Key features

Reactive cell execution with dependency tracking
Notebooks stored as pure Python files
First-class SQL querying support
Run as a script or deploy as an app
Interactive UI elements without callbacks
Built-in AI features and package management

Good fit for

→Reproducible data analysis in Python
→Turning notebooks into shareable apps

Built with: Python
Tags: notebook; python; reactive; data-science; sql; jupyter-alternative; apps; reproducible

Marimo: questions and answers

What is Marimo used for?: marimo is a reactive Python notebook stored as plain .py files that runs as a script or deploys as an interactive app. It is a good fit for reproducible data analysis in Python and turning notebooks into shareable apps.
Is Marimo open source?: Yes. Marimo is open source under the Apache-2.0 licence. Its source code is on GitHub at marimo-team/marimo and is written mainly in Python.
Is Marimo free?: Yes. Marimo is open source, so the software itself is free to use. A managed cloud version is also available.
What is Marimo an alternative to?: Marimo is an open-source alternative to Hex and DataSpell. Other open-source alternatives to Hex include Jupyter Notebook and JupyterLab.
Is Marimo actively maintained?: Yes. The most recent commit to Marimo was on 2 October 2026, and the latest release is 0.25.1, published on 1 October 2026. The project has 23k stars on GitHub.