The moment you mark an invoice sent, your client gets notified — then four more reminders go out automatically — before the due date, on it, and twice after — so you never have to send an awkward follow-up email again.
Every reminder is fully editable with merge fields for client name, amount, due date, and a link straight to the invoice.
See total outstanding, overdue invoices, and what's coming due — mark something paid and the reminders stop instantly.