Carapaz

Great app that has templates for your invoices, but also allows for a good degree of personalization according to your needs. App support is top notch with very quick replies and excellent assistance. The app is highly recommended!

Very good app that integrates easily and works fine, even in the free version. Much better than some other apps of this type. Customer support was quick and very competent, too, so I can only highly recommend this app for Shopify users.