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Codiff, a local diff review tool

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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!

HN · launched May 17, 2026 · 31 upvotes (top 20%) · 0 views

Niche: code diff and technical document viewers · 26 launches, 0 in the last 7 days · Explore this niche →

Category and tags
  • Horizontal
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

More like this: all 26 launches in code diff and technical document viewers →

Could you build this?

Yes The author literally notes having an LLM generate the app in an afternoon; it is a local terminal/web UI for rendering git diffs.

Discussion

20 comments analyzed.

Competitors mentioned: revdiff, hunk, diffnav, diffx, lumen (TUI alternatives), Kaleidoscope, File Merge, JetBrains diff view, diffs.com and trees.software

Concerns raised: JavaScript/Electron app not truly native, performance concerns vs. native code, Lacks mutation support (staging/unstaging changes), No commit-specific review capability yet, Needs polish and refinement, MacOS-only limitation mentioned

Feature requests: Screenshots and usage GIFs in README, Support for specific commits (for jj users), Mutations/staging and unstaging changes, File search functionality

Competitors

Other products that read as similar to this one : 195 launches clear the similarity bar, closest 8 shown.

Attention rank: #49 of 196 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 199 days after the earliest competitor.

Related data

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