Rachio review for Syncio Inventory Sync

We are using Syncio to enable drop-ship sales from one Shopify store (A) to another Shopify store (B). This functionality works exactly as we would like it to. Unfortunately, they cannot currently sync sales back the opposite way (a different product from store B to store A). I'm told this is on the road map. In the meantime, we are stuck searching for another app that does the exact same thing so that we can enable drop-ship sales in the other direction.