This project was born out of frustration with having to manually create invoices for Stripe payments and not wanting to pay give 0.4% to Stripe or pay for external services so I built it myself. It's inspired by @levelsio's Stripe invoice generator.
Since it's just plain HTML, CSS, and JS, once you clone the repo, it can run completely offline. Not that you'll ever need to, but you're ever on a plane with no internet and forgot to do some bookkeeping, you can do it with this simple app that runs in your browser.