Makes large AI-generated diffs reviewable in JetBrains IDEs.
Your coding agent just produced an 800-line diff. Reading it flat, file by file, is where review quality goes to die. Diffzu sends the diff to Claude and turns it into a tree of conceptual change-sets - "Auth refactor", "New endpoint", "Formatting noise" - each with a risk level and concrete review notes anchored to the exact lines. You review ideas, not files.
Install from JetBrains Marketplace
- Groups a diff into conceptual change-sets instead of one endless flat file list, with a risk level per group so you know where to look first.
- Attaches concrete review notes to lines - double-click jumps to the exact spot in the native IntelliJ diff viewer, with inline notes in the editor.
- Reviews local changes or a whole branch - uncommitted work, or current branch vs a base branch (merge-base semantics, works cross-branch without a checkout).
- Learns your review rules - select code, teach the reviewer to watch for (or ignore) similar patterns next time; rules live in your repo.
- Keeps per-project review history and exports any review to Markdown.
- An IntelliJ-based IDE 2025.2+ with the Git plugin enabled.
- Claude access, either way works: the Claude Code CLI on your PATH (uses your existing subscription) or an Anthropic API key (stored in the IDE password safe).
The plugin itself is free. You pay only for your own Claude usage, on your own account.
Does Diffzu send my code anywhere? Only to Anthropic, and only when you run an analysis: the diff (plus, optionally, a small bounded slice of related files) goes directly from your machine to Anthropic under your subscription or API key. There is no Diffzu server - we never receive, store, or see your code. Optional usage analytics are opt-in, pseudonymous, processed in the EU, and never include code, paths, or diff contents. Full details: Privacy Policy.
Why is the source code closed? Diffzu is a solo-built product with paid features planned; keeping the source proprietary is what makes that viable. The compiled plugin is free to install and use from official channels, the code it ships is unobfuscated, and everything it sends is documented in the privacy policy.
Why not just ask Claude Code / an AI assistant to review the diff? You can - the difference is the IDE layer: change-sets you can collapse, risk-sorted navigation, double-click to the native diff viewer, inline notes on the exact lines, and review rules that persist per repo. Diffzu is for reviewing in the place you already read code.
Which backends are supported? Claude Code CLI (default) and the Anthropic Messages API. You choose in Settings > Tools > Diffzu.
Open an issue: https://github.com/Diffzu/diffzu-support/issues
Helpful to include:
- IDE and version (e.g. IntelliJ IDEA 2025.2.4), OS, and Diffzu plugin version.
- Backend in use (Claude Code CLI or Anthropic API).
- What you did, what you expected, what happened. Screenshots welcome.
- Never paste secrets (API keys) or proprietary code you can't share.
Inside the IDE, when an analysis fails you can also use the opt-in "Report to Developers" action on the error notification (file paths are redacted before anything is sent).
- Privacy Policy
- License: the compiled plugin is free to install and use from official channels; it is proprietary software, (c) 2026 Robert Szumlas, all rights reserved.