I Built a Free, Offline Invoice App with Flutter - No Cloud, No Subscription, No BS

Every time I needed to invoice a client, I ran into the same wall: every decent invoice tool either locks your data in the cloud, wants a monthly subscription, or both. I just wanted something that works offline, keeps my data on my machine, and doesn't cost me anything . So I built it. Invoiso is a free, open-source desktop invoice app for Windows and Linux. No account. No internet. No recurring fee. Just a binary you run on your machine. Why Flutter for a Desktop App? Flutter is usually talked about in the context of mobile. But Flutter's desktop support has matured a lot - and it gave me a few things I really wanted: One codebase for Windows and Linux - I didn't want to maintain separate projects. A rich widget ecosystem - building forms, data tables, and PDF previews is fast. Dart's type safety - for a data-heavy app with models, migrations, and services, it helps. The build output is a native binary - no Electron, no Chromium, no 300 MB runtime. The Linux AppImage is lean and star