Web / Tools2026
WatchMark
A Chrome extension that watches one element and tells you the moment it changes
- JavaScript
- Chrome Extension APIs
- MutationObserver
- EmailJS
- HTML / CSS
Pick any element on any page and WatchMark tells you when its text changes — seat availability, appointment slots, stock, ticket drops. Built on MutationObserver with auto-reload for pages that only update on refresh, and selections that survive the reload.
- 01
Click-to-select any element
Highlight and click the thing you care about; the extension stores a selector that it restores after page reloads.
- 02
MutationObserver plus scheduled reload
Live DOM changes are caught instantly; pages that only change on refresh are reloaded on a 30-second to 5-minute cadence.
- 03
Three alert channels
Chrome notifications, an on-page alert, and email via EmailJS, so it works whether or not the tab is in front of you.
