21STUDIO
All agents
AdminComing soon

Payment Reminders

Flags overdue invoices and writes the right reminder for each customer. Kind the first time, firmer after.

For
Anyone who sends invoices and waits too long to get paid
Works with
The problem

Overdue invoices pile up. Chasing them costs time and awkwardness, and your cash flow suffers.

The result

Flags overdue invoices and writes the right reminder for each customer. Kind the first time, firmer after.

One agent run

It works on its own. It stops where your yes matters.

Example · made-up data
One run · Payment Reminders
  1. 01Checks overdue invoices
  2. 02Drops anyone who's paid
  3. 03Writes the reminders
  4. 04Waits for your yes
  5. 05Sends the reminders
  6. 06Passes replies to you

Log

  1. 9:004 overdue invoices, €6,200 in total
  2. 9:031 payment arrived yesterday
  3. 9:082 polite, 1 firmer
  4. 9:14Waiting for your yes: 3 reminders

Lands on Gmail or WhatsApp

GmailPayment Reminders · 9:14

3 invoices are still overdue, €4,700 in total. The reminders are written: reply OK to send them.

GmailWhatsApp
How it works

A week with the Payment Reminders agent.

  1. Mon
    On its own

    Checks overdue invoices, from your business software or a spreadsheet.

  2. Tue
    On its own

    Writes a reminder for each: polite the first time, firmer after.

  3. Wed
    Your turn

    You approve or edit. The first reminder to each customer goes out only with your ok.

  4. Thu
    Pauses

    The customer replies or disputes: it stops. That conversation is yours.

  5. Fri
    On its own

    Sends you the recap: who paid, who didn't, what's still owed.

Example · made-up data
Reminder · to approve
To
accounts@bar-example.com
Subject
Reminder: invoice no. 118
Overdue
15 days

Hello,

a quick reminder that invoice no. 118 of 30 September is still unpaid.

If you've already paid, please ignore this message. Otherwise, a copy is attached with our bank details.

Goes out only after your yesTo approve

Illustrative example, with a made-up business and data.

You approve

Nothing goes out without your OK.

What it does alone and what it asks you, we decide together at installation.

On its own

  • Checks overdue invoices
  • Writes the right reminder for each
  • Tells you who paid and who didn't

Asks you

  • The first reminder to each customer goes out only with your ok.
  • If the customer replies or disputes, the agent stops and the conversation passes to you.
  • It writes only polite reminders: formal notices and legal steps stay with you.
What’s included

At launch, it includes.

One payment. We install it, tune it to your business, and it stays yours.

Payment Remindersall included
  1. InstallationWe install it and connect it to your tools. You don't lift a finger.
  2. Tuned to your businessWe teach it your offer, your voice and your rules, then test it with you on real cases.
  3. 30 days of supportFor a month after launch, write to us anytime. We fix it.
  4. Yours to keepOne payment. The agent, the code and the data stay yours. On your machine, €0/month. On our server, optional Support from €49/month.
Admin

Payment Reminders

Coming soon

Expected price: from €149, one-off + VAT.

Need it sooner? Book a call →
Questions

Straight answers.

What do I need?

Your list of invoices with due dates and payment status, from your business software or a spreadsheet, and the inbox to write from.

Does it send formal notices or lawyer's letters?

No. It writes only polite reminders. Legal steps stay with you and your lawyer.

Who sees my data?

Invoices and contacts stay in your tools. The agent reads them only to write the reminders.

Can I use it for my clients?

Yes. The agent is yours: use it for your business and for the work you do for your clients.

Do I need to know about AI?

No. We install it and tune it. You read what it proposes and decide.

Any other costs?

You pay us once, plus Support only if you want it. The agent runs on an AI service under an account in your name: you pay that usage straight to the provider, with no markup. On the call we tell you what it costs in your case.

Can I pay monthly?

Yes, with a plan: from €79/month + VAT, with the agents you choose, AI credits, setup and our server included. Minimum 3 months, then cancel anytime.

What happens after 30 days?

The agent stays yours and keeps working: on your machine for €0/month, or on our server with Support from €49/month. No minimum term, cancel anytime.