Free invoicing API for SaaS

Billing data in.
Invoices out.

One API call turns your billing data into a branded, print-ready PDF invoice - and hands back a link you can send straight to your customer. No PDF library to babysit.

Start free See pricing
  • 100 free invoices a month
  • No card required
  • One API call
console.reamus.app

Invoices this month

Free plan

62 of 100

invoice-2043.pdf2000.9s
invoice-2044.pdf2001.0s
receipt-2044.pdf2000.8s
invoice-2045.pdf2000.7s

Every document your billing flow sends, one endpoint

invoice.pdf receipt.pdf statement.pdf credit-note.pdf reminder.pdf quote.pdf subscription.pdf tax-invoice.pdf

Reviewed by the teams already sending invoices.

Every review comes from a signed-in Reamus account, and we publish all of them - good, bad, or lukewarm. No cherry-picking the five-stars, no burying the rest. Just honest opinions from teams actually sending invoices.

One endpoint. Every billing document.

Invoices, receipts, statements, dunning notices - your whole billing flow, rendered from the same HTML you already style. Fonts, logo, page breaks and all.

Invoices

Line items, totals, and your letterhead, straight from your billing data.

Receipts

Auto-fire a branded receipt the moment a charge succeeds in your billing webhook.

Statements

Roll a customer's month of charges into one account statement they can file.

Reminders

Dunning notices with a pay link, generated on a schedule until the bill clears.

One request. That is the whole integration.

Drop it in your billing webhook. Post your invoice HTML, real Chromium renders it in a sandbox, and the PDF bytes - or a link to send your customer - come back in about a second.

  • Any language that can speak HTTP
  • A4 or Letter, margins, headers, page numbers
  • Get a hosted link to send, or the raw bytes to attach
terminal 
curl https://api.reamus.app/v1/pdf \
  -H "Authorization: Bearer rm_live_..." \
  -d '{ "html": "<h1>Invoice</h1>" }' \
  --output invoice.pdf
# 200 OK - 0.9s invoice.pdf

Everything around the invoice, handled.

Branded layouts

Your logo, fonts, and colors. A4 or Letter, margins, and page numbers on long invoices.

Links you can send

Set store and get back a short-lived URL - email it to your customer or drop it in your app.

Live usage console

A quota meter, a 30-day chart, and a log of every invoice you have generated.

Sandboxed rendering

Your billing data renders in an isolated Chromium - timeouts, capped concurrency, private networks blocked.

Every ream owes the forest.

1% of all revenue - every plan, every month - funds carbon removal and reforestation.

Deducted when your invoice is paid, not pledged at year-end.

Pick a plan by volume.

Every plan renders the same invoice with the same features. The only difference is how many you send a month, starting with 100 free.

  • Free$0100 a month
  • Pro$29 /mo2,500 a month
  • Max$79 /mo15,000 a month
Start free See full pricing

Send your first invoice.

Copy one curl command and generate a customer-ready invoice before your coffee cools.

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