Closo runs in your browser through a Chrome extension. Without it installed, we can't talk to Poshmark, Mercari, Vinted, or Depop on your behalf. The extension is what crosslists items from your account (and, for sellers in the Poshmark sharing canary, runs automated shares).
How to install
1. Open Chrome (or any Chromium browser — Edge, Brave, Arc all work).
2. Visit the Chrome Web Store and search for "Closo Crosslister".
3. Click Add to Chrome → Add extension. The Closo logo will appear in your toolbar.
4. Pin it: click the puzzle icon → click the pin next to Closo. Now it's always one click away.
How to check the version
Click the Closo icon in your toolbar. The version number is shown at the bottom of the popup. Chrome keeps the extension up to date automatically; if it ever looks stale, open chrome://extensions, turn on Developer mode, and click Update to force a refresh.
How to tell it worked: the Marketplaces page shows a Closo Extension card reading Extension is installed and active, and the Inventory page shows an Extension connected chip. If you see Extension not detected instead, reload the Closo tab.
Watch the step-by-step video guide