←back to thread

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

(0github.com)
262 points lawrencechen | 4 comments | 30 Oct 25 14:21 UTC | HN request time: 0.223s | 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

1. otterley ◴[31 Oct 25 01:01 UTC] No.45767265[source]▶
You’re not going to be able to keep the domain name 0github.com for too long. I’d suggest you start finding a new one immediately.
replies(1): >>45767622 #
2. personjerry ◴[31 Oct 25 02:10 UTC] No.45767622[source]▶
why?
replies(2): >>45767665 #>>45767714 #
3. nine_k ◴[31 Oct 25 02:21 UTC] No.45767665[source]▶
For the same reason your diff viewer highlights it: it looks like a scam attempt, not like a clever pun.

You likely will be able to keep it without trouble, but many corporate security systems would flag it.

4. otterley ◴[31 Oct 25 02:31 UTC] No.45767714[source]▶
Because it violates GitHub’s trademark. I expect them to send the author a cease and desist notice; and if the author is unresponsive or challenges the notice, GitHub will almost certainly initiate the dispute (UDRP) process, which will inevitably cede control of it to them.