The business below is our own idea for solving this problem, not a company described in these posts.
Who it’s for
Freelancers, creators, consultants and small agencies.
Adapt it to your industry
Start with one city, niche or customer type, then expand.
Ask your first 10 customers what they would pay before you build more.
Keep a human check on anything that is sent in a customer’s name.
Step by step
Pick one invoicing tool your customers use and connect it with an automation tool.
Write three reminder emails with AI: friendly, firm, final.
Schedule them at 3, 10 and 20 days overdue.
Add a weekly “who owes you” summary.
Charge a monthly fee by Stripe.
Keep the tone polite; follow debt-collection rules if you go beyond reminders.
Ready-to-copy prompt
Write three invoice reminder emails for invoice #[n] of $[amount] due [date]: a friendly nudge, a firm reminder at 10 days, and a final notice at 20 days that mentions a late fee only if my contract has one.
Start with AI
Opens the AI with this guide and the prompt filled in.
Build the first version: follow the steps above, or press “Open in ChatGPT/Claude/Grok” to get help.
Set up payments with Stripe payments (opens in new tab)(No monthly fee · 2.9% + 30¢ per card payment) and put the payment link on your page.
Get customers. X: post a short demo or before/after every day (free).
Get customers. LinkedIn: share results and message people in your target job (free).
Get customers. Communities: Facebook groups, Discord and Slack groups in your niche (free).
Offer your first 3 customers a “founding” price for honest feedback and a testimonial.
Charge $15 per user per month (monthly subscription), and ask every happy customer for one introduction.
Monthly cost$0–$52/monthFree tiers → paid plans of the tools above. Card fees come out of each sale.
What you could earn · EstimateEstimate: 30 users × $15 = $450/moOur estimate, not a fact or a promise. It’s simple math if you land these customers at this price.
Details: source, numbers and tags
What they did
Connect invoices once; AI sends friendly, escalating reminders on a schedule and tells you who’s late. We designed this business around a problem people post about on X; it is an idea, not a report of an existing company.
How it went
On X, 272 posts matched our search for this problem in the 7 days to 2026-10-15. The 24 top matching posts we checked drew 30 likes, 3 reposts and 24 replies.
Worth knowing
Reminders, not debt collection. Don’t threaten; follow local collection laws.
Difficulty
BeginnerOur rating
Time to build
Not reportedOur estimate
Monthly cost
Not reported
Revenue
Not reportedWe only show revenue the source states
Engagement
No public countThe source shows no number
X buzz
29.5 · 272 posts in 7 days30 likes, 3 reposts, 24 replies, 2 quotes on 24 top posts · fetched Oct 15, 2026 · query: (invoice OR invoices OR client) ("still haven't been paid" OR "still not paid" OR "haven't been paid" OR "late payment" OR "chasing payment" OR "chasing invoices") -is:retweet lang:en
Posted · Added Oct 15, 2026
Original builder recipe
ChatGPT
Claude
Pick one invoicing tool your customers use and connect it with an automation tool.
Write three reminder emails with AI: friendly, firm, final.
Schedule them at 3, 10 and 20 days overdue.
Add a weekly “who owes you” summary.
Charge a monthly fee by Stripe.
Keep the tone polite; follow debt-collection rules if you go beyond reminders.