Sync Scroll

About

Sync Scroll locks two browser tabs to the same scroll position. Scroll either tab; the other follows in real time. Built for comparing two versions of the same page—production vs staging, A/B variants, or old vs new.

HOW IT WORKS
• Set a source base URL and a target base URL (e.g. production.example.com and staging.example.com).
• Add a list of relative paths to compare, one per line: /home, /about, /products, etc.
• Click "Open Pair" to open the current path on both URLs in a new window.
• Scroll in either tab—the other stays in sync. Both show a "Sync Active" indicator when linked.

FEATURES

Synchronized scrolling — Scroll one tab and the other follows instantly. Sync is percentage-based, so it works even when the two pages have different heights or content lengths.

One pair at a time — Use Previous/Next to step through your path list. The current pair (e.g. "2 / 5") is always visible. Open, compare, then move on.

Auto-advance — When enabled, closing the synced window automatically advances to the next path. Great for quickly running through a long list without clicking Next each time.

Pass/Fail tracking — Mark each pair as Pass, Fail, or N/A. Add comments and optional tags. Track how many passed or failed at a glance in the popup.

Export & screenshots — Export results as a text report or CSV. Download screenshots of the source and target tabs (especially useful for failed comparisons) for documentation or bug reports.

Layout options — Choose side-by-side or stacked window layout. Adjust zoom for both tabs so you can compare at the same scale.

All configuration and results are stored locally. No data is sent to any server.