Invio

Judgement

What it is

Complete system

What it does

A small self-hosted invoicing app that creates invoices and exports e-invoice formats including Factur-X/ZUGFeRD, FatturaPA and UBL for PEPPOL.

Adopt it when

A freelancer wants simple self-hosted invoicing with European e-invoice output.

Watch out

Young and the author does not guarantee legal compliance for any country's e-invoicing rules.

Ready for

Usable

Runs as

Self-hosted server

Built with

TypeScript and Svelte

How established

Young: started 14 months ago, latest release v2.4.0.

What the license allows

You can take the code into anything, including a product you sell, with no conditions.

Judged on 2026-11-03 from the project's README and GitHub data. The license and age lines are worked out directly.

Compare Invio

Built from

Follow it down: Invio → TypeScript → Go → runs on a microchip

How compilers were built, back to punched paper tape

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