Zen
Zen+ChatGPT

Zen for ChatGPT

Your invoices, right inside ChatGPT

Connect Zen to ChatGPT and ask who owes you, find any invoice, or have it draft the next one. You review and send from Zen.

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Who owes me money?
Zen · Overview

You have $3,450 outstanding across 3 invoices:

  • Harbor Coffee · INV-0012$1,250
  • Atlas Studio · INV-0010$1,550
  • Bright & Co · overdue 6 days$650

Want me to draft a reminder note for Bright & Co?

What it can do

Your invoices, one question away

Ask what's owed

Outstanding and overdue totals, per currency, and who owes what.

Find any invoice

Search invoices and quotes by client, status or number, and open the line items.

Draft invoices and quotes

Describe the work and get a draft in Zen, ready to review and send.

Add clients

Create a client with their email, phone and address in one sentence.

Mark invoices paid

Tell it a client paid and the invoice is updated in Zen.

Nothing goes out without you

It can't send anything to your clients or delete data. Sending happens in the Zen app.

Connect

Add Zen to ChatGPT

You need a Zen account first. It takes about a minute, and you approve the connection in the Zen app on your iPhone.

Open ChatGPT settings

Until Zen is listed in the ChatGPT app directory, adding it uses Developer mode, which is available on paid ChatGPT plans.

  1. 1

    Turn on Developer mode

    In ChatGPT on the web, open Settings → Apps & Connectors → Advanced settings, and turn on Developer mode.
  2. 2

    Create the app

    Back in Apps & Connectors, choose Create. Name it Zen, paste the server link below, and choose OAuth.
  3. 3

    Sign in to Zen

    A Zen page opens with a QR code. Scan it with your iPhone and tap Allow in the Zen app.
  4. 4

    Use it in a chat

    Start a new chat, pick Zen from the tools menu, and ask away.

Server link

https://api.zeninvoice.io/mcp

Try asking

Just say what you need

“Who owes me money, and what's overdue?”
“Draft an invoice for Harbor Coffee: logo design, $500, and two rounds of revisions at $75.”
“Make a quote for Atlas Studio for a website redesign, €2,400.”
“Mark INV-0012 as paid.”
“How much did I get paid this month?”
“List my unpaid invoices for Bright & Co.”

Privacy and control

You decide what it can do

What ChatGPT can access. Your invoices, quotes, clients and totals in the Zen account you approved. It can create drafts and clients and mark invoices paid.

What it can't do. Send anything to your clients, delete data, or see other Zen accounts.

Where your data goes. When you ask about your invoices, Zen sends the answer to ChatGPT so it can reply. Whether OpenAI may use your chats to improve its models depends on your ChatGPT settings (Settings → Data controls). See our Privacy Policy.

Disconnect anytime. In Zen, open More → AI assistants and tap Disconnect, or remove the app in ChatGPT.

Questions

Do I need Zen Pro?+

No. Any Zen account can connect to ChatGPT.

How do I sign in?+

When ChatGPT asks you to sign in, a Zen page shows a QR code. Scan it with your iPhone and tap Allow in Zen. No iPhone with you? Use the emailed code option.

Can it send invoices to my clients?+

No. It creates drafts. You review and send them from the Zen app.

Which Zen account does it use?+

Your own Zen account: the one signed in on the iPhone where you tapped Allow.

Something isn't working+

Email support@zeninvoice.io and tell us what you asked and what happened.

Also using another AI app? Zen works with any app that supports MCP. See all AI assistants.