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aider vs cs249r_book

aider and cs249r_book share 29 technologies: pyarrow, anyio, tornado, cycler, fonttools, soupsieve, contourpy, matplotlib, Rich, prompt-toolkit, nltk, OpenAI, scikit-learn, sentence-transformers, torch, transformers, jinja2, markdown-it-py, markupsafe, mdurl, pillow, beautifulsoup4, pypandoc, annotated-types, jsonschema-specifications, Pydantic, referencing, jsonschema, and psutil. Both are written in Python.

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What they share and what sets them apart

Aider-AI

aider

aider is AI pair programming in your terminal

Python50kRead on November 5, 2026, at commit 5dc9490What is aider built with?

Only in aider

In common

harvard-edge

cs249r_book

Machine Learning Systems: Foundations, Scaling, Agentic AI, and Physical AI (Vols I–IV) • Harvard CS249r | https://mlsysbook.ai

Python30kRead on November 8, 2026, at commit de87c01What is cs249r_book built with?

Only in cs249r_book

Side by side

SizeLines written by people and agents, without generated ones; code files, without tests.
aider40,345 lines written80 code files
cs249r_book821,581 lines written1,977 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.
aider89.5% of its commits signed by AIWith Aider, Gemini CLI, Codex, and Claude Code
cs249r_book2.7% of its commits signed by AIWith Codex, Claude Code, Gemini CLI, and Cursor
ActivityFrom GitHub and its history, on the day SeeRepo read it.
aiderLast push May 22, 202612,461 commits49,968 stars
cs249r_bookLast push November 8, 202622,351 commits30,011 stars
TestsThe files that test the code, and the share of code files a test imports.
aider57 test files42.5% of its code files have a test that imports them
cs249r_book629 test files16.6% of its code files have a test that imports them

Frequently asked questions

Which is bigger, aider or cs249r_book?
cs249r_book, with 821,581 lines written; aider has 40,345.

The proof: harvard-edge/cs249r_book's code at commit de87c01

Which has more GitHub stars, aider or cs249r_book?
aider, with 49,968 stars; cs249r_book has 30,011.

The proof: Aider-AI/aider on GitHub

Which has more tests, aider or cs249r_book?
cs249r_book, with 629 test files; aider has 57.

The proof: harvard-edge/cs249r_book's code at commit de87c01

Which was updated more recently, aider or cs249r_book?
cs249r_book: its last push was on November 8, 2026, and aider's on May 22, 2026.

The proof: harvard-edge/cs249r_book's commits on GitHub

Which has more commits signed by AI, aider or cs249r_book?
aider: an AI signed 89.5% of its commits, with Aider, Gemini CLI, Codex, and Claude Code; in cs249r_book, 2.7%.

The proof: the commits each tool signed in Aider-AI/aider

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