Reorderly Stock helps merchants avoid stock-outs by tracking the velocity of each products sales and how long current stock will last. It syncs product, inventory, and order data from Shopify to calculate daily sales velocity and days of stock cover for every variant. Products are automatically classified as safe, reorder soon, or reorder now based on supplier lead times. Merchants can manage suppliers, create purchase orders, email them directly, and receive stock back into Shopify inventory.