---
title: "About Quittio"
description: "Who is behind Quittio, how we work and why Quittio is open core: an open-source e-invoicing library for PHP and Laravel."
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> Index of every page on this site: [llms.txt](https://quittio.dev/llms.txt)

# Invoice sent, invoice paid: settled.

Quittio comes from the German “Quittung” (receipt) and “quitt sein” (to be settled). We want e-invoices in Laravel to be as natural as sending mail.

## How we work

- ### Specification before code

  Every rule is described and backed by a source before it is built.
- ### Official validators

  KoSIT and veraPDF decide whether an invoice is valid, not us.
- ### Tax review

  Legal texts and defaults are reviewed by a tax adviser. Open questions are listed publicly in the README.
- ### Open core

  Creating and validating is free. Managed funds the ongoing maintenance of the rules.

## Who is behind it

Quittio is developed and run by Niklas Forst (Niklas Forst – Softwareentwicklung, Ettinghausen, Germany; see the imprint). Questions about using Quittio belong on GitHub; everything else goes to kontakt@niklasforst.de.

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