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dagster vs ray

dagster and ray share 31 technologies: React, azure-storage-blob, Celery, pyarrow, deltalake, Google Cloud Storage, Google, FastAPI, graphene, starlette, AIOHTTP, uvicorn, react-router-dom, Rich, SQLAlchemy, alembic, sqlglot, azure-identity, pyjwt, oauth2client, MLflow, markdown, jinja2, Pydantic, jsonschema, validators, boto3, kubernetes, docker, psutil, and prometheus-client. Both are written in Python.

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What they share and what sets them apart

dagster-io

dagster

An orchestration platform for the development, production, and observation of data assets.

Python16.4kRead on November 7, 2026, at commit 55208daWhat is dagster built with?

Only in dagster

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.
dagster1,373,416 lines written3,347 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.
dagster1.4% of its commits signed by AIWith Claude Code, Gemini CLI, and Aider
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.
dagsterLast push November 7, 202628,090 commits16,376 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.
dagster2,682 test files15.3% 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, dagster or ray?
ray, with 1,531,664 lines written; dagster has 1,373,416.

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

Which has more GitHub stars, dagster or ray?
ray, with 44,213 stars; dagster has 16,376.

The proof: ray-project/ray on GitHub

Which has more tests, dagster or ray?
dagster, with 2,682 test files; ray has 2,168.

The proof: dagster-io/dagster's code at commit 55208da

Which was updated more recently, dagster or ray?
dagster: its last push was on November 7, 2026, and ray's on November 6, 2026.

The proof: dagster-io/dagster's commits on GitHub

Which has more commits signed by AI, dagster or ray?
ray: an AI signed 3.6% of its commits, with Claude Code, Gemini CLI, GitHub Copilot, Cursor, and Codex; in dagster, 1.4%.

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

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