Show HN: Codiff, a local diff review tool

· devtools · Source ↗

TLDR

  • Codiff is a native macOS desktop app for reviewing staged and unstaged Git diffs locally before committing, with LLM walkthrough and inline comment export.

Key Takeaways

  • codiff -w generates an LLM-powered walkthrough of your current Git changes.
  • Inline comments on changed lines can be copied as Markdown with full diff context for follow-up review.
  • Targets pre-commit review of both staged and unstaged changes via a terminal helper installed from within the app.
  • macOS only at v0.1.0; install via release page download, then enable the codiff CLI through Codiff > Install Terminal Helper.

Hacker News Comment Review

  • The macOS-only constraint is the primary friction point; commenters flagged this immediately as a limiter for cross-platform teams.
  • A commenter shipped a comparable web-based tool, prereview, built specifically to review Claude-generated changes over Tailscale, signaling active parallel development in agentic diff review tooling.
  • JetBrains users noted Codiff covers gaps the IDE diff view misses, particularly file search, suggesting real incremental value even for IDE-heavy workflows.

Notable Comments

  • @realrocker: Built a Tailscale-accessible web prereview tool with a /prereview Claude skill and a Hand-off button for agentic workflows, as a direct parallel to Codiff.

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