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polars vs ray

polars and ray share 17 technologies: pylance, s3fs, pyarrow, pyiceberg, deltalake, Flask, flask-cors, pydata-sphinx-theme, sphinx-design, matplotlib, SQLAlchemy, azure-identity, jax, torch, openpyxl, Pydantic, and boto3. polars is written in Rust and ray in Python.

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What they share and what sets them apart

pola-rs

polars

Extremely fast Query Engine for DataFrames, written in Rust

Rust40.3kRead on November 6, 2026, at commit a2a4deaWhat is polars built with?

Only in polars

In common

ray-project

ray

Ray is an AI compute engine. Ray consists of a core distributed runtime and a set of AI Libraries for accelerating ML workloads.

Python44.2kRead on November 6, 2026, at commit 77567c5What is ray built with?

Only in ray

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
polars953,615 lines written2,273 code files
ray1,531,664 lines written2,777 code files
Who writes itA commit counts as AI's when it carries its signature: a Co-Authored-By line, its author name or the merge of its branch.
polars0.9% of its commits signed by AIWith Claude Code, Cursor, GitHub Copilot, and Gemini CLI
ray3.6% of its commits signed by AIWith Claude Code, Gemini CLI, GitHub Copilot, Cursor, and Codex
ActivityFrom GitHub and its history, on the day SeeRepo read it.
polarsLast push November 6, 202616,254 commits40,274 stars
rayLast push November 6, 202632,373 commits44,213 stars
TestsThe files that test the code, and the share of code files a test imports.
polars671 test files11% of its code files have a test that imports them
ray2,168 test files9.7% of its code files have a test that imports them

Frequently asked questions

Which is bigger, polars or ray?
ray, with 1,531,664 lines written; polars has 953,615.

The proof: ray-project/ray's code at commit 77567c5

Which has more GitHub stars, polars or ray?
ray, with 44,213 stars; polars has 40,274.

The proof: ray-project/ray on GitHub

Which has more tests, polars or ray?
ray, with 2,168 test files; polars has 671.

The proof: ray-project/ray's code at commit 77567c5

Which was updated more recently, polars or ray?
Both got their last push on November 6, 2026.

The proof: pola-rs/polars's commits on GitHub

Which has more commits signed by AI, polars or ray?
ray: an AI signed 3.6% of its commits, with Claude Code, Gemini CLI, GitHub Copilot, Cursor, and Codex; in polars, 0.9%.

The proof: the commits each tool signed in ray-project/ray

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