Restockly

Restockly watches your sales and inventory and tells you what to reorder, how much, and by when. It computes sales velocity from your order history, skips days you were out of stock, and adds a seasonal adjustment once enough history exists. You set lead times and safety stock, and Restockly flags items at their reorder point, projects stockout dates, and turns flagged items into a purchase order in CSV or PDF. The formula is documented in the app, and the app only ever reads your store.