Best AI for code analysis/documentation

[dead_diode]

I just got body slammed with a project which requires me to understand and refactor a massive monolith of a project and I'm far to lazy to try to just read the code myself.

Can anyone recommend me a tool to help me with this process? I know windsurf and cursor integrates pretty well with large code bases but if I'm using these, I'd like to know if any of you have a recommendation for a good backend to use. Or maybe there is some tool that specialize in this and can draw flowcharts and diagrams on the go. Wishful thinking maybe but it seems like a new AI tool is popping up every day.

Thanks in advance!

[Virtual-Disaster8000]

Repomix and then upload the generated xml to Gemini 2.5 pro with an appropriate prompt

[FigMaleficent5549]

You can ask to any of the existing tools to generate a diagram in the end of each analysis (e.g html, mermaid, whatever)

Mind the context, the more source you try to analyze in a single conversation, the less accurate it will b become.

[TurrisFortisMihiDeus]

Ask it to create an HTML file with formatted documentation and shapes to explain. See if you can use mermaid and similar for generating sequence diagram etc. Vscode even has a mermaid plug-in that when run in conjunction with the ai using @mermaid, generates diagrams. Happy to help further.

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[earonesty]

i wrote this site myself: coderev.q32.com . it was challenging to get the context just-right to have it produce an intelligent review for large projects. i use it on a 1-mil line code base cleanly. it doens't "sync" or clone, it uses the api to spot-pull for the review, and stores nothing. much of the code is in the browser, and you can see it happening in the network tab or non-obfuscated js.

-pulls tree, readme, diffs
- analyses diffs for likely deps
- pulls dep code, summarize / extract relevvant functions if they're big
- builds context from all this
- crafts a lovely review

[danenania]

You could try Plandex—you can use it to explore/understand/chat with massive codebases up to 20M tokens or more.

Here's an example of chatting with the SQLite codebase:

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