• Customers: store each customer's bill-to address, billing email, and a single hourly rate.
• Projects: tie work to a customer, with an owner and start and end dates. Each invoice belongs to a project.
• Invoice builder: create draft invoices with line items (item, work accomplished, hours), and add an optional memo.
• PDF invoices: a formatted PDF with your logo, invoice number, bill-to address, remit-to address, line items, total, and terms.
• Review, approve, and send: a review step that shows the billing rate prominently next to a PDF preview. Approval emails the invoice to the customer.
• Void and reissue: void an approved invoice, then reissue it as a corrected draft.
• Payments: record a payment and split it across one or more of a customer's open invoices.
• Company settings: set the company name, remit-to address, and invoice logo.
• Weekly reminder email: a nudge to project owners to bill their active projects.
• Notes: each invoice has a threaded notes area for comments.

The top bar has tabs for Projects, Customers, Invoices, Payments, and Settings. It also has a notifications bell, a theme toggle, and a Sign out button.