I charged $9 once instead of $15/month — here's the tool I built

Six months ago I went to invoice a client and realized I was paying $15/month for software I use maybe twice a week.

So I did what any developer would do: I spent a weekend building my own.

The result is a single HTML file that:

• Opens in any browser, zero install

• Live preview as you type

• Exports a clean PDF in one click

• Works 100% offline — no data leaves your computer

• Supports 9 currencies, custom logo, tax & discount

I put it on Gumroad for $9 one-time. Buy once, use forever.

It's made for freelancers and small business owners who don't want another subscription eating into their margins.