Make a real PDF invoice in ChatGPT from one sentence
Ask ChatGPT for an invoice and you usually get text to copy into a template. Billsprig Invoice Maker is a free app (an MCP server with a ChatGPT widget) that does the maths and makes the file: tell it who the invoice is for and what you charged, and it works out line totals, tax, discounts and shipping in 26 currencies and hands you a clean PDF to download. Invoices, quotes, estimates and receipts; classic, modern or minimal; Letter or A4. It is one of five free CyberMax work apps for ChatGPT, alongside Ledgermoor Table to Excel, Recapwren Client Reports, Dutyfinch Tariff Lookup and Kevscope CVE Check.
The five free CyberMax work apps for ChatGPT: test prompts and expected results
| App | Ask it | You get |
|---|---|---|
| Billsprig Invoice Maker | Make an invoice for 12 hours of web design at $85/hour for Harbor & Pine Bakery | The invoice lines, subtotal, tax and total, and a Download PDF button that opens a real PDF |
| Billsprig Invoice Maker | Create a quote in GBP with 20% VAT for a boiler install | A GBP quote with VAT lines and a PDF link |
| Ledgermoor Table to Excel | Convert the table in this PDF to Excel | A preview of the table and Download Excel (.xlsx) / CSV buttons; amounts are numbers |
| Recapwren Client Reports | Write my weekly client report for Acme: sessions 12,400 (last week 10,900), leads 86 (71), goal 90 leads | Change and % change per metric, target status, a printable report link plus email text |
| Dutyfinch Tariff Lookup | What is the US import duty on HTS 8516.60.40? | General, special and column 2 rates and Section 301 status, with the official USITC link |
| Kevscope CVE Check | Is CVE-2024-3400 being exploited in the wild? | Marked 'act now': in CISA KEV with its due date, EPSS and CVSS 10 |
Source: Test prompts and expected results from the app submission kits, products/chatgpt-apps/kits/<app>/submission.md (generated from the apps' tool definitions).
Billsprig Invoice Maker for ChatGPT vs the alternatives
Published prices, each checked on the date shown; prices change, so confirm on each site.
| Product | Price | Free | Checked |
|---|---|---|---|
| Billsprig Invoice Maker for ChatGPT | Free in ChatGPT and any MCP client | Every tool, no sign-in | live |
| invoice-generator.com | Free (unlimited invoices, no signup) | yes | 2026-10-10 |
| Zoho Invoice | Free ($0); 500 invoices a year, 'Powered by Zoho Invoice' branding | yes | 2026-10-10 |
Why teams pick Billsprig Invoice Maker for ChatGPT
- It stays in the chat: describe the job in plain words and get a PDF, no form to fill in.
- The maths is done by code, not guessed by the model: line totals, tax, discounts and shipping.
- No account and nothing stored: the PDF lives only in a private download link that expires after 7 days.
- Free, and the same server works in other MCP clients such as Claude and Cursor.
How it works
- Add the app to ChatGPT as a custom connector with its MCP server URL: https://gpt-billsprig.cybermaxtools.com/mcp (custom connectors need ChatGPT's developer mode).
- Ask: 'Make an invoice for 12 hours of web design at $85/hour for Harbor & Pine Bakery.'
- Check the lines and total in the widget, then press Download PDF.
- Send the PDF; the link expires after 7 days and nothing is kept.
FAQ
Why not invoice-generator.com or Zoho Invoice?
Both are free and good if you are happy filling in a form or running invoicing software. Billsprig is for people who already work in ChatGPT and want to describe the job in a sentence and get the PDF there.
Can't ChatGPT make an invoice by itself?
It can write one as text or a quick file, but totals are generated by the model. Billsprig calculates the numbers with code and renders a consistent, print-ready PDF.
Is it in the ChatGPT app directory?
Not yet. Today you add it as a custom connector with its MCP URL; it also works in any MCP client.
Does it cost anything?
No. The ChatGPT app is free with a fair-use limit. Billsprig Pro on the web (your logo, history) is a separate, optional purchase.
Limits?
No logo on ChatGPT PDFs, no saved client list, no online payment collection; files expire after 7 days.