Show HN: Codiff, a local diff review tool (opens in new tab)

(github.com)

19 pointscpojer9d ago9 comments

Nowadays I review a lot of code locally that was written by llms. I used to review my own code using git + delta. It started to feel limiting with the amount of code written by llms.

When looking at a large diff on Friday I pointed an llm at diffs.com and trees.software and told it to build an app. It only took 16 minutes, is extremely fast for large diffs, beautiful and minimal.

Today I polished it up and added all the features that I need. It has file filters, search, an llm walkthrough mode, and review comments that you can paste back into your llm.

I will be using Codiff a lot, and can finally review the large diff from Friday that led me to build this If you like it, fork it!

9 comments

magnio8d ago

Is diff viewer the 2026 todo list?

List of vibe coded alternatives:

- revdiff: https://github.com/umputun/revdiff

- hunk: https://github.com/modem-dev/hunk

- diffnav: https://github.com/dlvhdr/diffnav

- diffx: https://github.com/wong2/diffx

- lumen: https://github.com/jnsahaj/lumen

tcoff918d ago

Can you include screenshots in your readme?

Also does it only work for staging and unstaged changes? I use jj so I need to be able to point it at commits since jj has no staging it just creates a new git commit snapshot every time you run any jj command.

realrocker8d ago

:) We are all converging on the same problems and tooling to fix them.

Built this in the last couple days to review changes done by claude on a hetzner box(over tailscale on my phone) and leave comments before pushing to remote : https://github.com/livetemplate/prereview.

Runs everywhere and can has a claude skill: /prereview which starts a new instance for the current changes. Has a “Hand-off” button to signal claude to process the comments.

UI is responsive. I use it on my iphone with claude mobile app + /remote-control to leave comments before pushing.Still requires polish but core features work.

cpojerOP8d ago

That’s awesome! I built this specifically as a GUI because it’s become too much code to effectively review in the terminal for me.

realrocker8d ago

exactly. LLM code output is so high that it has become unreasonable to review the code in terminal or ide

Evan-Purkhiser8d ago

Would love to see some screenshots in your readme of this!

realrocker8d ago

Yeah the project is right out of the oven so will add some usage gifs shortly to the repo. Meanwhile here are some screenshots on imgur: https://imgur.com/a/zxZo651

usernametaken298d ago

Surprisingly enough this has just a few features the JetBrains diff view is lacking, notably file search… good ideas

stephenr8d ago

Who knew that the killer task for LLMs would be "recreate existing things that exist without me mentioning them by name, based on a worse alternative as the example".

Kaleidoscope exists.

File Merge exists.

sjhalani79d ago

That's awesome. Been reviewing code diffs on the IDE and it's been hard, so will check this out!

atmanactive9d ago

... for MacOS.

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9 comments

magnio8d ago

Is diff viewer the 2026 todo list?

List of vibe coded alternatives:

- revdiff: https://github.com/umputun/revdiff

- hunk: https://github.com/modem-dev/hunk

- diffnav: https://github.com/dlvhdr/diffnav

- diffx: https://github.com/wong2/diffx

- lumen: https://github.com/jnsahaj/lumen

tcoff918d ago

Can you include screenshots in your readme?

realrocker8d ago

:) We are all converging on the same problems and tooling to fix them.

Runs everywhere and can has a claude skill: /prereview which starts a new instance for the current changes. Has a “Hand-off” button to signal claude to process the comments.

UI is responsive. I use it on my iphone with claude mobile app + /remote-control to leave comments before pushing.Still requires polish but core features work.

cpojerOP8d ago

That’s awesome! I built this specifically as a GUI because it’s become too much code to effectively review in the terminal for me.

realrocker8d ago

exactly. LLM code output is so high that it has become unreasonable to review the code in terminal or ide

Evan-Purkhiser8d ago

Would love to see some screenshots in your readme of this!

realrocker8d ago

Yeah the project is right out of the oven so will add some usage gifs shortly to the repo. Meanwhile here are some screenshots on imgur: https://imgur.com/a/zxZo651

usernametaken298d ago

Surprisingly enough this has just a few features the JetBrains diff view is lacking, notably file search… good ideas

stephenr8d ago

Who knew that the killer task for LLMs would be "recreate existing things that exist without me mentioning them by name, based on a worse alternative as the example".

Kaleidoscope exists.

File Merge exists.

sjhalani79d ago

That's awesome. Been reviewing code diffs on the IDE and it's been hard, so will check this out!

atmanactive9d ago

... for MacOS.

1 more reply

j / k navigate · click thread line to collapse