One card per invoice
Every invoice you send or receive gets one card in your alert channel. When it's viewed, paid or late, the card updates in place and Du3y notes who did what in the thread.
Du3 for Slack
Invoicing in Slack, right where your team already works.
Make an invoice with /du3 new, share a link for contractors with /du3 link, and see every invoice as a card in your finance channel. When a client opens it or pays, the card updates and your team knows straight away.
Works with Slack and Discord. More apps soon.
Set up in about five minutes.
Add Du3 to Slack
Create your Du3 account and connect your Slack workspace in one click.
Pick a channel and your admins
Choose the channel where invoice alerts go, like #finance, and pick admins from your Slack members or user groups.
Send your first invoice
Type /du3 new, fill in the form and send. Your client gets an email with an invoice page and a PDF.
Everything about an invoice, in one Slack card.
Ask in plain words
Mention Du3y and ask: "who hasn't paid yet?" or "invoice Northwind ₦1.2m net 14". Du3y saves a draft and asks before anything goes to your client.
Approvals built in
Owners and admins send straight away. When a channel member makes an invoice, admins see Approve & send and Reject on the card.
Automatic reminders
On the due date, and every few days after, Du3y posts a reminder in the card's thread until the invoice is paid.
Collect invoices too
Share a link and contractors send you complete invoices. Each one lands in Slack with the amount, due date and the answers to your fields.
Your data stays yours
Du3y only sees your own company's invoices. It knows which company you are from the Slack workspace, never from what anyone types.
Slack commands you'll use most
- /du3 new
- Opens a form to make and send an invoice to a client.
- /du3 link Amara
- Makes a link a contractor can use to send you an invoice.
- /du3 list overdue
- Shows invoices that are past their due date.
- /du3 paid INV-2026-10-K7Q2
- Marks an invoice paid and notes who did it (admins).
- /du3 summary
- What you're owed, what you owe and what's overdue.
See the full list in Using Du3y.
Questions
Do my clients need Slack or a Du3 account?
No. Your client gets an email with a link to a clean invoice page and a PDF. Slack is only for your team.
Who can mark an invoice paid in Slack?
Admins. You pick them from your Slack members or user groups when you set up Du3. Anyone in the alert channel can make invoices, share links and see invoices.
Does Du3 take payments in Slack?
No. Du3 keeps track of invoices and doesn't move money. Your client pays you the way they do today, and an admin clicks Mark paid when the money lands.
Can alerts go to more than one channel?
Yes, on the Business plan you can post alerts to more than one Slack channel.
Can I use Du3 without Slack?
Yes. Everything works on the web and in the iOS and Android apps, and Du3y also works in Discord.
How do I remove Du3 from Slack?
A Slack admin can remove it under Apps, then Du3, then Remove. Du3y stops posting straight away and your invoices stay in Du3.
Bring your invoices into your workspace.
Setup takes about five minutes.
Works with Slack and Discord. More apps soon.