Diffsmith.

Diffsmith

Diffsmith is a fast, native macOS application designed specifically for reviewing local git changes generated by AI coding agents. It eliminates the friction of manual code review by letting you drop inline comments directly on changed lines, then instantly convert those notes into perfectly-formatted prompts for your AI assistant or let your agent read them via MCP—no more retyping file paths or waiting for batches of changes to complete.

Product Highlights

• Native macOS Performance: Fully sandboxed, lightweight (3.9 MB) application with zero cloud dependencies, accounts, or telemetry—everything stays on your Mac.
• Inline Commenting: Click any line to leave anchored comments; a persistent sidebar tracks all notes with one-click navigation, and comments automatically move to "Past Comments" when their underlying code changes.
• AI-Ready Export: One-click "Copy Comments" transforms your review notes into customizable AI prompts with full code context, supporting single repo, multi-repo, or selective export.
• MCP Server Integration: Optional built-in local MCP server lets your coding agent read and reply to comments directly in-app, creating a seamless human-AI review loop without copy/paste.
• Professional Diff Tools: Syntax-highlighted diffs with side-by-side or inline layouts, expandable context, "hide whitespace" toggle, and live re-diffing as files change on disk.

Use Cases

• AI-Assisted Development Workflows: Review incremental changes from Cursor, Claude Code, or other AI agents as they're generated, providing immediate feedback without interrupting the agent's flow.
• Code Review & Quality Assurance: Professional developers and teams can conduct thorough pre-commit reviews with persistent annotations that survive code modifications, ensuring no feedback gets lost.
• Solo Developer Productivity: Individual developers working with AI coding assistants can maintain structured review cycles, track their own review progress with read/unread states, and generate contextual prompts for follow-up requests.

Target Audience

Diffsmith is built for macOS developers who actively use AI coding agents (Cursor, Claude Code, GitHub Copilot, etc.) and want a privacy-first, efficient way to review, comment on, and iterate on AI-generated code changes without leaving their local environment.