🔄 UniSwap — Universal Unit Converter

Convert anything. Instantly. Offline.

A fast, beautiful unit converter with dynamic accent colors per category. Pin your favorite conversions, copy results, works offline.

Features

• 4 categories — Length, Weight, Temperature, Volume
• Dynamic accent colors — each category has its own color identity
• Favorites — pin up to 10 conversion pairs for quick access
• Copy result — one-tap clipboard copy with unit name
• All units view — see every conversion at once
• Bidirectional — edit either field, result updates instantly
• Works offline — PWA, zero dependencies
• Russian UI — built for Russian-speaking users

How it works

1. Pick a category (tabs with arrow key navigation)
2. Enter a value
3. Pick units (overlay selector)
4. See result instantly
5. Star to save as favorite

Tech

• Single HTML file (~30KB)
• Vanilla JS, zero frameworks
• Factor-based conversion (temperature via Celsius intermediate)
• Overlay unit selector with focus trap
• ARIA tabs pattern with arrow keys
• PWA with service worker

License

MIT