Disclosure: I’m the developer of RestockSimple, a free Shopify app for reorder points, POs and suppliers - so take this as a biased data point, not a neutral recommendation.
Reading through this thread, the gap that comes up most (RunninWildKids.co’s post above especially) isn’t really “purchase orders” as a single feature, it’s the specific list Stocky quietly handled: PO export, stock takes, marking invoices paid/unpaid with due dates, and weighted COGS flowing into your P&L. Most replacement apps (mine included right now) cover PO creation and reorder points well, but the invoice-vs-PO distinction and COGS weighting are the parts that seem to trip people up post-migration.
RestockSimple handles POs, reorder points and suppliers, and recently added unit/landed cost tracking on POs based on a merchant’s feedback - but it doesn’t yet do the PO-to-invoice split some of you need (partial deliveries, separate invoice paid/unpaid tracking). Flagging that honestly rather than pretending it’s covered. If that workflow matters to you, I’d rather know about it than not.