Simple on purpose
From unpaid invoice to clear next step.
KindlyDue is for the stage before formal recovery: the invoice is valid, the payment is late, and you need to follow up without souring a working relationship.
- 01
Add only the details the message needs
Enter the client, invoice number, amount, due date, and optional payment link. You do not upload the invoice itself, create an account, or hand over a contact list.
- 02
Shape the wording—or start with a recommendation
Pick warm, friendly, clear, firm, or formal. Then match the real situation, choose a brief or detailed note, and decide whether to request payment, confirmation, an explanation, or a plan. You can add your own sentence too.
- 03
Review every word
KindlyDue creates a subject line and body from your facts. Read it, adjust it for the relationship, attach the original invoice, and only then send it from your own email.
- 04
Put the next action on the calendar
Download a standard calendar file with a calm follow-up rhythm. You stay responsible for deciding whether a payment plan, paused work, or professional advice is appropriate.
Ready when you are
Bring one late invoice.
The founding edition is free and does not require an account.
Write my follow-up →