Developer builds serverless invoice tool that runs as a single HTML file

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A developer has released Billfold, a browser-based invoice generator that requires no account, no subscription, and no backend server. The entire application is contained within a single HTML file, stores data in localStorage, and makes zero network requests. To share invoices without a server, the app encodes invoice data into the URL hash fragment, which browsers never transmit to a server, keeping all information client-side. PDF export is handled natively via the browser's print function, and a companion npm package allows developers to programmatically generate pre-filled invoice links. The project is MIT-licensed and available on GitHub, with a one-time paid unlock for premium features verified locally using the Web Crypto API.

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