A tool crafted with love for all the freelancers and small businesses that want their bureaucracy to be a little more organized and beautiful.
A tool fully compliant with the EU standard EN 16931 and the German standard XRechnung—tested through the official validator.
Supporting the motto “file over app,” this app saves
all data in the non-proprietary format JSON, which lets you truly own your data and store it as you please.
A tool built to match your brand’s identity—customizable your invoices through tweaking colors, fonts, and layout
to make it fit your style.
What People Say
Kind words from freelancers, makers, and friends—the people I’m building Billy for.
Simon has made an app that makes invoicing fun! Has that ever been a thing before? Well, it is now!
So much whimsy and fun, attention to detail, and custom iconography.
It’s so encouraging to see a Mac app like this. It’s like all the elements of great Mac apps past are coming back, and I am here for it. Great stuff!
One for the freelancers/moonlighters amongst us who are sick of over-complicated invoice solutions.
Piccalilli
I am so excited about this. An insanely Mac-assed app through and through. And that in 2026.
I am going to start using this for my freelance invoice billing. If you freelance and write your invoices in Pages, like me, this is for you.
Billy is such a wonderfully designed app with tons of personality.
I’m really excited about this! I’ve been looking for an app that I can use for exactly this purpose, and all the good ones from the old days seem to have atrophied and died.
Billy is really nice.
The Whole Invoicing Toolkit
From the first draft to a paid invoice, Billy has the tools for each step—keep an overview and stay in control.
Status tracking
Clear status indicators provide clarity and control.
Multiple profiles
For multiple activities, you can create separate profiles with their own invoice number sequences.
Well-structured, professional invoices
Invoices should be well-structured, easy to read, easy to understand, and visually appealing.
Individual styling
Style invoices to give them their own visual identity without compromising aspects such as readability.
Valid e-invoice
As required in Germany starting no later than 2028, exports are compliant e-invoices.
Local and open
Storing invoices in your Mac’s file system allows for high flexibility and individual workflows.
