Only problem that now occured is, after a few opens/closes, there are 2 unknown errors appearing and all data is gone (customers and invoices) and I cannot create a new invoice. Here, after entering all information in a new invoice and clicking "Save & Preview" this happens:

Thanks! Yes, now it works. Nice app, kudos! For me (I make invoices in multiple languages) it would be cool to have deeper customization, especially naming of the fields and the ability to change currencies for each invoice. Also, an inventory of items would be cool, so that it would be possible to add items from the "inventory" (like the contacts) or add a new one if needed.

In the end, invoice apps are all about speed and creating an onvoice without hassle - it's very promising in this area! If you allow me the question - could this electron app be ported to e.g. Android as well?

I would love to try it, I'm on Windows, and only v1.1.0 is available with an installer (only .exe.blockmap for v1.1.1). I get the same issue with a blank screen