AI Invoice Generator
Send a client's details and a formatted, print-ready invoice lands in their inbox — generated and delivered in seconds, with no template to fill in.
Problem
Invoicing is small, repetitive, and easy to postpone — which is exactly why it slips. Every invoice means opening a template, updating the client name, the service, the amount, the date, incrementing the number, exporting to PDF, writing the email, attaching the file, sending. Ten minutes of low-value work, repeated for every job — and the errors are quiet ones: a stale figure copied from the last invoice, a duplicated invoice number, a client who never receives theirs because the send got forgotten during a busy afternoon.
Before
Invoicing was a fully manual, multi-app task — template, PDF export, email, attachment — with no guarantee it happened the same way twice, or at all.
After
A webhook-triggered workflow builds a structured prompt, generates a styled HTML invoice, and emails it straight to the client. Nothing depends on someone remembering to send it.
Interactive workflow
Click through the actual node graph
Screenshots
Curious what it looks like?
Letting AI write the invoice, without letting it touch the numbers
Using AI to lay out the invoice means the design can adapt to whatever details come in, instead of forcing every invoice into one rigid template. But the risk with AI is that it can get creative in places it shouldn't — like rounding a price or misreading a date. So the workflow keeps AI on a short leash: it's only ever asked to write the layout and wording. Every actual number that matters — the client's name, the service, the amount, the invoice number, the date — is calculated ahead of time and handed to it directly, never left for the AI to fill in itself.
The invoice number and the date are worked out by the workflow itself, not by the AI, so those two details are always accurate no matter how many invoices go out.
Built to open cleanly in an inbox
Invoices are written so they display correctly directly inside an email, instead of relying on a separate style sheet that most email apps would strip out anyway. There's also a small touch for print: a "Print Invoice" button that disappears automatically if the client actually prints the page, so what they end up with is a clean document, not a webpage with a stray button on it.
Shown right in the email, not hidden in an attachment
The finished invoice appears directly in the body of the email, not as a file the client has to open separately. The moment they open the email, they see the finished invoice — no extra click required.
Where this goes next
A more polished version would use a fixed, professionally designed invoice layout every time, and only let AI handle the parts that genuinely change from job to job — like a line-item description or a short note in the client's own language — while every number and the overall structure stay exactly the same on every invoice.
Impact
A ten-minute manual task becomes a single submission — the client gets a professional, print-ready invoice within seconds.