Sync Tabs Across Windows, Same Tabs in Every Window - Tabtwinsy

Mirror the same tabs and tab groups across every browser window. Open a new window and your tabs are already there. Free and local.

Tabtwinsy keeps the same tabs and tab groups mirrored across all of your browser windows — automatically. If you loved Arc's Spaces, you know the feeling: open a new window and your tabs are just there. Almost no browser does that. Tabtwinsy brings it to Chrome (and any Chromium browser). What it does • The same set of tabs mirrored live across every window • Tab groups mirrored too — membership, names, and order • Open a new window and it's already populated, focused on the tab you were on • One click to turn on or off — the toolbar icon is the switch (green ON / grey OFF). No popup, no settings to fiddle with. Built to be safe with your tabs • A tab you're actively using is never disturbed — anything playing audio (a live call), your active tab, or a known meeting URL (Google Meet, Zoom, Teams, Webex, and more) is protected and never closed or navigated away. • A built-in safety limiter halts activity if anything ever looks runaway, so it can't spiral. • Incognito / private windows are ignored completely — never read, mirrored, or touched. Private by design Everything happens on your own computer. Tabtwinsy has no servers and makes no network requests — your tab data never leaves your device. No analytics, no tracking, nothing sold or shared. Turn it on, open a window, and forget about it.