Bundles.app ‑ Inventory Sync

A very helpful app adding functionality which pretty much should've been hardcoded in Shopify. The app is minimalistic and very intuitive, and the developer, Harold, is immensely helpful and responding to tickets usually in a matter of minutes.

An update after over a year using the app: it is still great, and the developer, Harold, is always super helpful. He's been kind and patient enough to help us disabling some of the app functionality on the backend so that it wouldn't interfere with some of our 3PLs---and he always seem to reply within minutes from writing to him!