Track Changes for Outlook Email
Someone edited your email — what changed? Email Compare will be an Outlook add-in for Microsoft 365 that redlines any two emails in a thread: every insertion and deletion marked tracked-changes style, a change list to step through, accept or reject each edit — right inside Outlook, nothing uploaded.It doesn’t exist yet. We’re building it now, and you can be first to know.
One email when it launches, a couple as it takes shape. Unsubscribe anytime.
Built by Christopher Atlan at Leitmotif GmbH. Making file-comparison tools since 2020 — building software for over 18 years. diff.tools is one idea: a focused tool for each format, with results you can hand from one tool to the next.
What we’re building
Redline any two emails in a thread
Not just the latest reply against the one before: pick any two versions in a back-and-forth — first draft against final, if that’s the question — and see every change between them, marked like a document redline.
An add-in that lives in Outlook
Built for Microsoft 365: new and classic Outlook on Windows, Outlook for Mac, and Outlook on the web. The comparison runs entirely inside the add-in pane — no desktop application to install or keep running in the background.
Accept, reject, send clean
Walk the changes one by one, keep what you agree with, reject what you don’t — and come away with a clean copy ready to send, no manual re-styling.
Attachments go to the right tool
Emails carry documents. Word, PDF, spreadsheet, and image attachments route straight to their own diff.tools compare — the suite is built for exactly this hand-off.
