DuePress + WooCommerce
Most “WordPress invoicing” plugins are actually WooCommerce invoicing plugins — they generate PDFs for store orders and are useless without a cart. DuePress is the other kind: a standalone invoicing system that needs no store at all.
No WooCommerce? Perfect.
If you bill clients for services — design, development, consulting, anything quoted rather than carted — you don’t need an ecommerce stack. DuePress connects directly to Stripe or Square and handles the entire invoice lifecycle itself: line items, delivery, payment, receipts, reminders.
Running WooCommerce? Also perfect.
DuePress detects WooCommerce and reuses what you’ve already configured: your country list and your existing Stripe or Square credentials. No duplicate gateway setup, no conflicting checkout flows — Woo keeps selling products, DuePress handles the quoted work.
Invoices vs orders — when you need both
A store order is self-serve: the customer picks, pays, done. An invoice is negotiated: scope agreed, deposit up front, balance on delivery. Agencies and product companies often need both — Woo for the storefront, DuePress for the project work. They coexist on one site without stepping on each other. See everything DuePress does.