The payment reminder app for freelancers. Nüdge Theory sends polite, professional reminders automatically, so you focus on your work, not chasing invoices.
No invoicing software needed.
Nüdge Theory is invoice reminder software built for freelancers. Set up a reminder in under a minute. Polite, automatic follow-ups handle the rest. Works with any invoicing tool you already use.
Why we built this
There is a moment every freelancer knows. The work is done. The invoice is sent. And then the waiting begins. Not for the money. For the courage to ask for it.
We built Nüdge Theory because that moment should not exist. A well-timed, gentle reminder changes behavior more reliably than pressure, ultimatums, or silence. Not because people are weak. Because people are busy.
Your client gets a polite heads-up. The invoice gets paid. The relationship stays intact. You never had to write the awkward email.
The problem
You did the work. You sent the invoice. Now you're waiting, wondering if you should send a reminder without sounding pushy.
"Hey, just checking in on invoice #247... no rush, but wanted to make sure it didn't get lost..."
1,386
Reminders sent
How it works
Add your client's email, invoice amount, and due date. Takes less than a minute.
Polite, professional emails go out before and after the due date, automatically.
Clients pay on time. You never had to send an awkward follow-up.
Why Nüdge Theory
Because you have better things to do than chase invoices.
Stop tracking due dates and drafting reminder emails. Nüdge Theory does it for you, on schedule, every time.
Our reminders are friendly and professional. Clients appreciate the heads-up, not the pressure.
Consistent, well-timed reminders show clients you run a real business, even if it's just you.
One late payment recovered more than covers the cost. Most freelancers save hundreds per year.
See it in action
Our reminders are warm and polite, the kind of email you'd write yourself if you had the time. No robotic templates. No aggressive language.
Hi Sarah,
Hope you're doing well! Just a friendly reminder that invoice #1042 for $2,400 is due this Friday, March 15th.
No rush if it's already in process, just wanted to make sure it didn't slip through the cracks.
Thanks so much,
Alex
Pricing
Choose the plan that fits your needs.
Solo
$29/mo USD
Everything you need to get paid on time. Period.
Growth
$59/mo USD
For freelancers turning their side hustle into a real business.
Studio
$109/mo USD
For studios and small agencies managing multiple client relationships.
Included in every plan
30-day money-back guarantee. No risk, no hassle.
Questions
No, Nüdge Theory only handles reminders. You keep using whatever tool you already use to create and send invoices (FreshBooks, Wave, even a simple PDF). Nüdge Theory just makes sure clients don't forget to pay. Learn more in our guide to payment terms.
All plans include a small "Sent automatically by Nüdge Theory" note at the bottom of reminder emails for transparency. Clients see professional, personalized reminders that feel like they came directly from you.
Absolutely. Mark a reminder as paid with one click and all scheduled emails stop immediately. You're always in control.
Just mark the invoice as paid in your dashboard. Nüdge Theory won't send any more reminders for that invoice. It takes two seconds.
Nüdge Theory sends automated invoice reminders on a schedule you control: before the due date, on the due date, and after. Each reminder uses professional, friendly language so you never have to write an awkward follow-up email again.
We offer a 30-day money-back guarantee. If Nüdge Theory isn't working for you, email us at hello@nudgetheory.app within 30 days of your first payment and we'll refund you in full, no questions asked.
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