Every freelancer and small agency eventually needs the same thing: a way to bill clients that doesn’t involve a spreadsheet held together with formulas. The usual answer is to sign up for an invoicing SaaS — and then keep paying for it, every month, for as long as you’re in business.
InvoiceForge breaks that pattern — and we’ve just listed the full source code on the Megastore76 store.
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What it does
InvoiceForge is a working invoicing app, not a template or a mockup. Add your clients, build an invoice, and it handles the rest:
- Client management — add, edit, and organise every client you bill
- A multi-line invoice builder with live subtotal, tax, and total calculation as you type
- Sequential invoice numbering (INV-0001, INV-0002…) so nothing gets duplicated or lost
- A status workflow — draft, sent, paid — with a dashboard showing outstanding vs. paid totals at a glance
- A dedicated, print-optimised invoice view for one-click “Print to PDF” from any browser
Why it’s worth a one-time purchase
Most invoicing SaaS tools charge a recurring fee for exactly this core workflow — typically $5-15/month, and considerably more once you add clients or team seats. Over a couple of years that adds up to hundreds of pounds for functionality that, at its core, is a form, a calculation, and a PDF. InvoiceForge gives you the same day-to-day toolkit as a one-time purchase you host yourself.
What’s inside
- Full TypeScript source code: Next.js, Prisma ORM, Tailwind CSS
- Seeded demo data (3 clients, 4 invoices across every status) so it looks alive immediately
- A README covering setup, moving from SQLite to Postgres for production, and where to add a real PDF library if you want fully automated generation later
It’s built for freelancers, small agencies, and developers who want a real invoicing tool on their own infrastructure — without adopting another monthly line item.
Get it
InvoiceForge is available now as a one-time source-code purchase: InvoiceForge — Self-Hosted Invoice Generator & Client Manager (Source Code).
This is the third release in our series of focused, problem-solving tools — small, working products that solve one real, recurring pain point well, rather than trying to be everything to everyone. More to come.
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