Invoice chaser for freelancers

Micro-SaaSweekendWeb

StackNext.jsResendStripe

Search demandLowFew people are searching for this.
CompetitionLowThere are few direct competitors.
Customer valueLowCustomers are likely to spend a little.
How scoring works

The idea

Every freelancer has unpaid invoices and every freelancer hates sending the awkward “just following up on this” email. The task is 100% automatable: it’s a schedule and good copy. Existing invoicing suites (FreshBooks, etc.) bury reminders inside a big product; this does one thing.

Who pays

Freelancers and small agencies. This is a classic “aspirin not vitamin” product — you buy it the week a client goes 30 days overdue. Price at $9/month or $5/invoice-chased; the value (getting paid) is orders of magnitude above the price.

MVP scope

  • Manual invoice entry (no accounting integrations yet)
  • Three canned escalation sequences, editable
  • Daily cron that sends due reminders
  • Mark-as-paid kills the sequence
  • Skip for v1: Xero/QuickBooks sync, payment links, multi-user
// Build prompt — paste into Cursor / Claude Code / Lovable / Bolt
Build a micro-SaaS called ChaseKit that follows up on unpaid invoices
automatically.

Core flow: a freelancer connects their email (or just uses our sending
domain), adds an invoice (client name, client email, amount, currency, due
date, PDF attachment optional), and picks a follow-up schedule: gentle
(7/14/21 days overdue), standard (3/7/14), or firm (1/5/10). The app sends
pre-written, polite escalating emails from templates the user can edit.
When the user marks the invoice paid, follow-ups stop and a "thanks for
settling" email optionally goes out.

Stack: Next.js (App Router) + TypeScript, Tailwind, SQLite via Prisma (or
Supabase Postgres), Resend for email sending, and a daily cron route
(Vercel Cron) that finds overdue invoices due for their next reminder and
sends it.

Pages: landing page with the three escalation templates shown as real
examples, dashboard listing invoices with status (upcoming / overdue /
chasing / paid), invoice detail with the email timeline, and a template
editor. Include a settings page for sender name and signature.

Write the three escalation email sequences yourself — they should be
genuinely well-written, warm but firm, the kind a British accountant would
send. This copy is the product.

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