One-off Invoice Generator

A simple, free invoice generator for payments received from clients built with plain HTML, CSS, and JavaScript. This project was born out of frustration with having to manually create invoices for Stripe payments and not wanting to pay for external services so I pretty much vibe coded this with Claude Code inspired by @levelsio's Stripe invoice generator. - No Backend Required: Runs entirely in your browser - Works Offline: Clone the repository and run completely offline - no internet connection needed after initial download - localStorage Persistence: Your invoice details are automatically saved - Print to PDF: Generate professional PDFs using your browser's print function - Customizable: Add your company logo and details - Real-time Preview: See your invoice update as you type - EU VAT Support: Automatic VAT calculation and reverse-charge handling for EU businesses - Multiple Line Items: Add multiple products/services to your invoice - Country Selection: Built-in country dropdown with all global countries - Business & Client Management: Save and reuse frequently used business and client details - Responsive Design: Works seamlessly on desktop and mobile devices - Clean Print Layout: Optimized print styles for professional PDF output 1. Business/Client Selection: - Choose from saved businesses/clients or create new ones - Save frequently used details for quick reuse - See "Unsaved changes" indicator when details are modified 2. Company Setup: Select your company's country and add your logo (or choose from presets) 3. Invoice Details: Set invoice number, issue date, and due date 4. Customer Information: Add customer details including country and VAT number (for EU businesses) 5. Add Line Items: Add one or more products/services with quantities and prices 6. VAT Handling: - Automatic VAT calculation based on EU rules - B2B reverse-charge support for cross-border EU transactions - Smart detection of when VAT should apply 7. Print/Export: Click "Print / Export as PDF" to generate your invoice One-off Invoice Generator is the open-source project sunergos-ro/invoice-generator (https://github.com/sunergos-ro/invoice-generator) by sunergos-ro, released under MIT. Ion packages it unmodified from commit 4179c7a6686d, adding only a manifest, an icon and a storage compatibility script.

Written by sunergos-ro, published to Oikou by Ben Grande.

• ★ 48 stars on GitHub
• Licence: MIT
• Built from commit 4179c7a6686d

View the repository on GitHub

Not rated. Nobody has said who this app is suitable for, so Personal Clouds and the Oikou app treat it as 18+.

Internet

It asks to reach these hosts, and no others:

• api.github.com
• oneoffinvoice.com
• analytics.monocube.com
• buttons.github.io

Personal Cloud tools

• Keep a database of its own on your Personal Cloud ion.db

Notifications

It does not send push notifications.

Storage

Up to 16 MB on your Personal Cloud.

Sign in to add this web app to a Personal Cloud of yours. It runs there, on your own computer, and you open it from there; nothing is installed on your phone.

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