Invio
by kittendevv
Invio is a self-hosted invoicing application that keeps things simple while still producing invoices in several European electronic formats. It is for people who want to create and send invoices from their own server without a large accounting package.
- Stars
- 1.2k
- Licence
- Unlicense
- Runs on
- A small server
- Setup
- Moderate
- Language
- TypeScript
- Age
- 431 days
What you can do with it
- Create and manage invoices from a self-hosted web app
- Generate Factur-X / ZUGFeRD 2.2 invoices for German and French customers
- Produce FatturaPA (Italy) and UBL 2.1 / PEPPOL BIS 3.0 electronic invoices
Make money with it
A freelancer could host Invio for their own billing, or set it up for other small businesses as a paid installation and support service.
An idea, not financial advice. Check the licence before charging for anything built on it.
Ways a business could use it
- Replace a monthly invoicing subscription with a free app on your own server
- Send compliant electronic invoices to clients in countries that require formats such as FatturaPA or UBL
Can you use it commercially?
Free to use, change and sell, including in paid products. Keep the copyright notice.
Not legal advice. Read the project's licence file before building a product on it.
Getting it running
The README points to a Quick Start guide in the wiki; as a self-hosted app it is likely set up with Docker, but the README does not say so directly.
Follow the official instructions in the project README.
Things to check
- The author does not guarantee legal compliance in any country, so check your local invoicing rules
- Only a basic invoicing feature set, not full accounting
- Maintained by a single developer
Who's talking about it
- OpenSourceCRMs team: Best Invoicing Software for Small Business (published 18 Oct 2026) Featured in a roundup
Checked 30 Oct 2026. Summary drafted by AI from the project's README.
