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Show HN: I made a heatmap diff viewer for code reviews

(0github.com)
262 points lawrencechen | 1 comments | 30 Oct 25 14:21 UTC | HN request time: 0.36s | source

0github.com is a pull request viewer that color-codes every diff line/token by how much human attention it probably needs. Unlike PR-review bots, we try to flag not just by "is it a bug?" but by "is it worth a second look?" (examples: hard-coded secret, weird crypto mode, gnarly logic, ugly code).

To try it, replace github.com with 0github.com in any pull-request URL. Under the hood, we split the PR into individual files, and for each file, we ask an LLM to annotate each line with a data structure that we parse into a colored heatmap.

Examples:

https://0github.com/manaflow-ai/cmux/pull/666

https://0github.com/stack-auth/stack-auth/pull/988

https://0github.com/tinygrad/tinygrad/pull/12995

https://0github.com/simonw/datasette/pull/2548

Notice how all the example links have a 0 prepended before github.com. This navigates you to our custom diff viewer where we handle the same URL path parameters as github.com. Darker yellows indicate that an area might require more investigation. Hover on the highlights to see the LLM's explanation. There's also a slider on the top left to adjust the "should review" threshold.

Repo (MIT license): https://github.com/manaflow-ai/cmux

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smcleod ◴[30 Oct 25 20:45 UTC] No.45765105[source]▶
Why does it require signing and granting you full access to act as me on Github to use?

cmux-agent requires access to your Github account:

    Verify your GitHub identity
    Know what resources you can access
    Act on your behalf
    View your email addresses
I would have logged an issue for this but I see you've disabled logging issues on the repo. Seems a bit sus to me.
replies(3): >>45765207 #>>45765804 #>>45769040 #
smcleod ◴[30 Oct 25 21:51 UTC] No.45765804[source]▶
It's when you first start the app it asks you to login using GitHub before you see anything else.
replies(1): >>45767432 #
1. lawrencechen ◴[31 Oct 25 01:35 UTC] No.45767432[source]▶
cmux desktop app currently requires signing in to GitHub. We will build out better support for local repositories and remove sign in requirement soon.