Oxilayer PDF Invoice Generator

If you're looking for an invoice app that provides value for money, with incredible support, look no further ! I started with the free version which was very useful while starting my company, and have now moved to the paid plan. I'm very surprised by the level of support I've received, to implement automatic invoice emailing (which is mandatory in the EU) and to implement custom VAT data on the invoices, from other apps that validate EU VAT numbers. There are tons of useful features which I still have to discover!