syncX Stock Sync Inventory CSV

Best decision I made for my Shopify store. Saves a lot of time. Very prompt customer service, too.

This is my second review.
This app deserves more than 5 stars. Best app I have ever used in the app store. Ask anything and you get a reasonable response. If you sell on multiple marketplaces, they help you syncing your store with that, too. You don't need to go to anything else. And the customer service take their job very seriously.
Great app!