Codiff, a local diff review tool
Details
- External ID
- 48166275
- Source
- HN
- Company
- —
- Product
- Codiff, a local diff review tool
- Website domain
- github.com
- Launched
- May 17, 2026
- Cohort
- —
- Upvotes
- 31
- Upvotes percentile
- 0.8012924071082391
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Description
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!
Enrichment
- Theme
- Claude integrations and coding agents
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- local code diff review tool
- Manually corrected
- False
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 — 99 launches clear the similarity bar, closest 8 shown.
Attention rank: #26 of 100 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 199 days after the earliest competitor.
- CodeDiff · hn · 2026-09-29 · 6 upvotes · similarity 0.54
- Sidenote · hn · 2026-07-05 · 9 upvotes · similarity 0.48
- Linear Diffs · ph · 2026-05-29 · 178 upvotes · similarity 0.45
- Diffswarm · hn · 2026-01-06 · 8 upvotes · similarity 0.44
- CodeRLM · hn · 2026-02-11 · 81 upvotes · similarity 0.44
- Diffing Binary Files · hn · 2026-08-05 · 19 upvotes · similarity 0.44
- I rebuilt the only parts of my IDE I use, in Rust, over a weekend · hn · 2026-06-22 · 50 upvotes · similarity 0.42
- I built a CLI that turns your codebase into clean LLM input · hn · 2026-04-24 · 10 upvotes · similarity 0.41
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.