iiinova — where your digital self keeps evolving

Billy

@usebilly.app

A Mac app to make bureaucracy a little more beautiful Built by @simonlou.com usebilly.app

Billy @usebilly.app · 28/07/2026

Somehow I forgot to introduce Billy version 1.1 here! It’s out of beta since last week with some highly requested features like multi-page invoices, markdown formatting, and support for the US Letter format. #indiedev #macos #BuildInPublic

Illustration of three new features: Multi-Page Support, Document Formats, Markdown Formatting

163

Billy @usebilly.app · 26/06/2026

A lot of people still write their invoices in Pages, or even InDesign—so did I. Most accounting tools out there are web-based, expensive, and keep your data hostage. Pages works, but was never meant for this, and that makes it easy to mess simple things up. #indiedev #macos #BuildInPublic

The left side of the screen displays icons for Pages, Figma, InDesign, and Word. An arrow points from these icons to the Billy icon on the right side.

192

Billy @usebilly.app · 03/05/2026

The Beta has been open to the public since yesterday. I would love to find some people willing to give it a try. It might be able to simplify your invoicing workflow. I would really appreciate any feedback. testflight.apple.com/join/aCCf242f #indiedev #macos #BuildInPublic

A graphic introducing “Billy,” an e-invoicing Mac app in open beta.

150

Billy @usebilly.app · 24/04/2026

Introducing the invoicing app for freelancers, “Billy”—creating, managing, and customizing e-invoices. Everything done locally and natively. #indiedev #macosdev #buildinpublic

Announcement poster of the app “Billy”. Open Beta on May 1, 2026.

060