Etsy is a popular marketplace for handmade and vintage items, and many store owners use it to reach a wider audience. Etsy integration apps can help you list your products on Etsy, track your sales, and manage your orders. Most Etsy integration apps also allow you to sync your product inventory so you don't have to manually update your listing when an item goes out of stock. Some Etsy integration apps also work the other way around, allowing you to bring listings from Etsy to Shopify.