See what changed
since your last visit
A Chrome extension that automatically tracks webpage changes and shows you a clean diff when you return. Zero setup. Completely private.
Add to Chrome — It's FreeThe annual subscription costs $49/year$79/year and includes access to all features.
Members receive priority support and early access to new tools.
Your data is stored on our secure servers in the USwith our third-party cloud partners globally.
Cancel anytime from your account settings.
A 30-day notice period applies to all cancellations.
How it works
Install
One click from the Chrome Web Store. No account, no configuration.
Browse
The extension silently snapshots pages you visit. You do nothing.
Return
Revisit any page and see exactly what changed, highlighted in context.
Features
Zero config
Works on every page automatically. No watchlists, no polling intervals, no setup wizards.
Smart extraction
Uses Mozilla's Readability engine to focus on real content. Ignores ads, navigation, and timestamps.
Private by design
All data stays in your browser's local storage. No servers, no accounts, no analytics. Nothing leaves your machine.
Meaningful diffs
Word-level change detection that filters trivial updates. Surfaces only changes worth knowing about.
SPA support
Works on modern single-page applications. Detects client-side navigation and re-captures automatically.
Lightweight
150 KB total. No performance impact on your browsing. Smart deduplication keeps storage minimal.
Built for curiosity
Track policy changes
Companies quietly edit their terms, privacy policies, and pricing pages. Now you'll notice.
Follow evolving stories
News articles get edited after publication. Headlines shift, details change. See the evolution.
Monitor competitors
Product pages, feature lists, and job postings change. Stay informed without setting up alerts.
Privacy
What Changed stores all data locally in your browser's IndexedDB. No data is ever transmitted to any server. No accounts, no analytics, no tracking. Your browsing data stays yours.