Paienta

Inventory forecasting for Shopify stores. Paienta reads your order history and tells you what to reorder, how much, and by when.

It shows its working. Every number comes with the sales it was built from, so you can check it against Shopify’s own reports instead of taking it on trust.
It says what it doesn’t know. Thin history, no seasonality yet, a product that was out of stock rather than unwanted — Paienta tells you, instead of quietly guessing.
It never sees your customers. Paienta asks Shopify for units sold per product per day, and nothing else. No names, no email addresses, no order records.