I thought about using something like this for my invoices, or even doing something on my own, but in reality I made an HTML page with a bunch of "contenteditable" attributes, edit it directly in the browser, sometimes fiddle in devtools to remove some things, and print as pdf. Somehow it feels wrong because my mother couldn't do that, but since I can it's actually the fastest way to get it done for me.

But anyway it's a nice tool for people who want to do something with little fuss. Some nitpicks:

* if I refresh the page, all the data is lost

* custom select boxes are ok, but the list of currencies is huge. in a normal select box I could just type "EUR" and it would select that option. Here I need to scroll for a long time.

* an annoying thing in general is tracking the invoice number. It would be nice if it would remember the last one. Of course there are all sorts of complexities here, like people have different "systems" on how it's called and how to increment

* my company is always the same, so it would be nice if this data was saved. Sorry if it already does, I didn't see it.

But thanks for sharing in any case.