Conformo

The open-source invoice tool that produces legally valid electronic invoices, not just good-looking PDFs. EN 16931 semantic model, serialized to Factur-X, ZUGFeRD, XRechnung, UBL 2.1 and Peppol BIS, validated live against the official CEN Schematron plus each country's CIUS rules.

Where to start

• Open the app — no signup, nothing installed.
• Validate an invoice you already have — checks it against the official Schematron, entirely client-side.
• Compliance status by country — generated from a sourced dataset.
• Source on GitHub
• Contributing