HalfHalf

A beautiful, Nordic Minimalist 60/40 co-pay Progressive Web App (PWA) calculator designed specifically for mobile smartphone viewports.

It simplifies co-payment splits where the government covers 60% and you pay 40%, incorporating a daily subsidy limit.

Features

• Locked 60/40 Ratio: Calculations are hardcoded to the 60:40 split structure for speed and simplicity.
• Editable Inline Cap: Adjust your remaining daily government subsidy directly from the main tracker widget.
• Bidirectional Inputs: Enter the original price, the government portion, or your portion—the other two values calculate instantly.
• No-Scroll Mobile Design: Specifically optimized to fit fully on smartphone screens without vertical page scrolling.
• Logs Archive Drawer: Review saved calculations, search entries, or clear history in a sleek sliding menu drawer.
• Export to CSV: Download your calculation history to a spreadsheet file.
• Daily Reset: Only today's records count against the subsidy cap, so it refreshes every day.
• Light & Dark Themes: Follows your system setting, with a manual toggle.
• Full Offline PWA: Fully installable on your device's home screen and functions completely offline via service worker caches. No third-party requests: fonts and icons are bundled.
• Persistent Storage: Your calculations archive and daily cap changes are saved locally to localStorage so they persist across page refreshes.

Technologies Used

• HTML5 & CSS3: Semantics and custom variables for light and dark themes.
• Vanilla JavaScript: calc.js holds the pure split logic (integer satang, unit tested); app.js handles the UI, service worker registration and localStorage.
• Lucide Icons: Inlined as an SVG sprite in index.html (ISC license).
• Fonts: Inter & Instrument Serif, self-hosted in fonts/.

Running Locally

To host this locally:

1. Clone or download this folder.
2. Spin up any simple HTTP server (e.g. npx http-server).
3. Open http://localhost:8080 in your browser.

Tests

The calculation logic is covered by Node's built-in test runner (Node 18+, no dependencies):

npm test

Author

Made by pichayakorn.

License

This project is licensed under the MIT License - see the LICENSE file for details.