Invoice Printer vs eInvoicing

Super simple PDF invoicing library for Ruby

A Ruby library for generating clean, professional PDF invoices with minimal code. No complex templates or configuration needed — define your invoice data and get a PDF. Supports custom fonts, logos, and localization. Perfect for solo developers who need invoicing in their Ruby or Rails app without pulling in a heavyweight billing platform.

Library for creating European-compliant electronic invoices

A PHP library for reading and creating electronic invoices compliant with the European EN 16931 standard. Supports Factur-X, ZUGFeRD, and UBL formats. If you sell to businesses in the EU and need to generate legally compliant e-invoices, this library handles the complex XML and PDF/A requirements so you do not have to.