Comment on an AI agent's code
Only for Mac
$5.99
Diffsmith is a fast, native macOS studio for reviewing local git changes & commits made by your existing AI agent. You can use Diffsmith to leave inline comments, then hand them straight back to the AI as a perfectly-formatted prompt or let your AI agent read and reply to them via MCP. Open a repo, read the uncomitted diff or a past commit, drop notes on the exact lines that matter, and work with any AI assistant you already use to get a response or get the code changed. No more retyping file names and line numbers by hand. No more waiting for all changes to be completed before you type out review notes. REVIEW LIKE A PRO - Open one or more local git repositories from a folder picker. Everything stays on your Mac. - Browse changed files (modified, added, deleted, renamed, untracked) with per-file diff stats. - Syntax-highlighted diffs with side-by-side or inline layouts, expandable context, and a "hide whitespace" toggle. - Diff against HEAD, HEAD plus staged changes, a single commit, a range of commits or between two branches. - Mark hunks and files as read to collapse them; any change to that code brings them back automatically. - Live re-diffing as files change on disk. The view stays current without refreshing. COMMENT ON THE LINES THAT MATTER - Click any line to leave a comment anchored to that exact spot. - A persistent sidebar lists every comment; click to jump straight to the code. - Edit and delete freely, with intuitive keyboard shortcuts you already know. - Comments whose code has changed move to a Past Comments tab instead of silently disappearing. HAND IT BACK TO YOUR AI - One-click Copy Comments turns your notes into an AI-ready prompt, complete with code context. - Fully customizable prompt template with a live preview. - Working across several repos? Copy from the active repo, a specific repo, or all of them at once. LET YOUR AGENT CONNECT (optional) - Turn on the built-in local MCP server and your coding agent can read your comments and reply to them in-app (no copy/paste needed). - Loopback-only and off by default. Turn on or off at any time. - Agent comments are clearly distinguished from your own throughout the app. PRIVATE BY DESIGN - Fully sandboxed and native. No account, no cloud, no telemetry. - The app makes no outbound network calls. The only networking is the optional, local-only agent server you switch on yourself. WORK YOUR OWN WAY - Adjust code font sizes to suit your needs. - Use Light or Dark mode, or a mixture of both. - Select from 20+ syntax themes. - App tint color matches your macOS defaults. Diffsmith is a one time purchase for lifetime access.
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This version introduces some improvements to Walkthroughs: - Your Agent can now see replies you made to Walkthrough steps even after you have ended a Walkthrough - You can now make Walkthroughs open automatically (check the Comments tab in Settings) - Your Agent can now start a Walkthrough for a repo you don't have open in Diffsmith (providing Diffsmith is running and you've opened the repo at least once in the past)
Version 1.2.3
Data Not Collected
The developer does not collect any data from this app.
Information
- Compatibility
Requires macOS 15.0 or later.
- Mac
Requires macOS 15.0 or later.
- Mac
- Copyright
- © 2026 Mergeable Pty Ltd