Now in private beta

Quiet, automated reminders that get your invoices paid.

Duespark sends polite, scheduled payment reminders so freelancers and small service businesses never have to chase a late invoice again. Drop in an amount, a due date, and a payment link — we run the sequence.

Get early accessSee how it works

Free for 3 active invoices • No card required • Works with any payment link

INV-2026-0419

Awaiting payment

Invoice from

Mara Lindgren Design

Billed to

Northwind Coffee Roasters

1208 Latrobe Ave · accounts@northwind.co

Due

Aug 29

Total

$1,840.00

Reminder lane

4 of 6 sent · replying with check

Why Duespark

Chasing invoices is the worst part of freelancing. We took it off your plate.

Other tools write the invoice or run your books. Duespark only does one thing — and it does it on autopilot.

1 linkto a fully scheduled sequence

Drop in a link, walk away

Stripe Invoice, PayPal link, Wave, even a plain URL — Duespark only needs the amount, due date, and where to send the customer.

6 touchesdefault schedule, optional per invoice

Polite, never pushy

A pre-due nudge, then 3 / 7 / 14 / 30 days past due — fully customizable. Each email reads like you wrote it, not like a collection agency.

3 tonesplus full manual override

Tone that fits the customer

A built-in AI writer drafts every reminder in friendly, professional, or firm tone — amount, due date, and payment link never change.

The default sequence

Six touches. You write zero of them.

Edit any step, drop any step, or add your own. The cadence below is what most freelancers settle on within a week.

  1. 1
    T−3d

    Friendly heads-up

    Friendly · Confirm + offer help

  2. 2
    Due

    Due-date notice

    Professional · Send payment link

  3. 3
    T+3d

    Polite nudge

    Professional · Confirm receipt

  4. 4
    T+7d

    Firm follow-up

    Firm · Restate terms

  5. 5
    T+14d

    Final reminder

    Firm · Late-fee notice

  6. 6
    T+30d

    Last attempt

    Firm · Collection handoff

Duespark AI writer

Three tones. Same invoice. Zero rewrites from you.

Pick a voice per invoice or per client relationship. The amount, due date, and payment link never change — only the warmth does.

  • Numbers, dates, and links pass through verbatim.
  • Override any sentence inline before it sends.
  • Tax the AI with one click — yours controls the final draft.
Live tone preview
Same invoice, same duespark sender, three moods.
From:Mara from lindgrendesign.co <mara@lindgrendesign.co>
To:accounts@northwind.co
Subject:Payment due August 29: INV-2026-0419 ($1,840.00)
Hello,
This is a scheduled reminder that invoice INV-2026-0419 for $1,840.00 was due on August 29. As of today, the balance is outstanding.

To complete payment: pay.duespark.app/i/2026-0419. Receipts are issued automatically — please retain them for your records.

If you have any questions about the line items, reply directly to this email.

Regards,
Mara Lindgren
Mara Lindgren Design

Invoice data, link, and dates stay identical — only the warmth shifts.

Pricing

Free until your reminders start earning their keep.

Upgrade when you outgrow Free — never because of a feature paywall. Cancel any time.

Free tool

Overdue Invoice Reminder Generator

Paste your invoice details, get a polite, ready-to-paste email — free, no sign-up. It runs entirely in this page; nothing is sent from here. When you're ready to automate, the same email becomes one of the Duespark reminders.

  • Three tones — friendly, professional, firm.
  • Works with any client and any payment link.
  • No data leaves your browser until you copy and send.
Try it inline
Email us with your three inputs and we'll draft the reminder for you, hand-back, no strings.
  • Invoice— amount & due date
  • Payment link — any URL
  • Tone — friendly, professional, or firm
Get my free draft

Replies usually within 1 business day.

FAQ

Concerns we'd want answered too.

Ready when you are

Stop chasing. Start collecting.

One email, one invoice, and Duespark takes it from there. We'll get you set up personally.

Get startedFree first. We reply within one business day.

Duespark

Quiet, scheduled payment reminders for freelancers and small service businesses. The boring, mostly hands-off piece of SaaS that just keeps paying you back.

Contact

duespark-2@polsia.app