Polars

Judgement

What it is

Building block

What it does

A DataFrame and SQL query engine written in Rust, used from Python, Rust, Node.js or R, that runs queries in parallel and can spill to disk.

Adopt it when

Your pandas workloads are slow or run out of memory on a single machine and you can rewrite them in Polars' expression API.

Watch out

Its API differs from pandas, so existing code needs rewriting, and some libraries still expect pandas objects.

Ready for

Production-ready

Runs as

Library

Built with

Rust, Python and Apache Arrow

How established

Established: started 6 years ago, latest release py-2.1.0.

What the license allows

You can build it into a product you sell, as long as you keep its copyright notice.

Judged on 2026-11-06 from the project's README and GitHub data. The license and age lines are worked out directly.

Built from

Follow it down: Polars → Rust → runs on a microchip

How compilers were built, back to punched paper tape

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