Closo is a Chrome extension plus a web dashboard. Both are needed to crosslist — the extension drives the marketplace web clients on your behalf.
Three steps
1. Install the extension
From the Chrome Web Store. Pin it to your toolbar so the badge is always visible.
2. Connect a marketplace
Open the Marketplaces page in the dashboard, click Connect on Poshmark/Mercari/Vinted/Depop/eBay/Shopify.
3. Crosslist your first product
Open Crosslister, pick a product, choose target marketplaces, click Crosslist. Closo handles the rest.