Unit Converter & Calculator US

UnitFlip is a fast, ad-free unit converter for iPhone — built for people who want quick answers without a cluttered calculator interface. The whole app is a pair of cards. Type a value into the top card, watch the result update on the bottom card in real time. Swipe left or right to cycle through eight unit families. Tap a card header to pick any unit inside the family. Tap the swap button to invert the conversion. That is the entire app. Key features: • 8 unit families — Length, Mass, Temperature, Area, Volume, Speed, Time, Data — 60+ units total. • Swipe to switch family — left or right on either card cycles to the next family. • Card-style picker — tap a card header to pick from a clean list of units within the family. • Live conversion — the result card updates as you type, with adjustable decimal precision (0–10 places). • Swap button — instantly invert From ↔ To. • Favourites — tap the star to save any pair (e.g. kg → lb) for one-tap access. • History — last 50 conversions kept locally. Tap to revisit, swipe to delete. • Big keypad — designed for one-thumb input. No tiny number row, no surprise auto-fill. • Decimal precision setting — choose how many fraction digits to show. Privacy by design: UnitFlip collects nothing. No analytics, no ads, no tracking, no account, no network calls. All data is stored locally in UserDefaults on your device. UnitFlip is for you if: • You convert units multiple times a day and want it to feel instant. • You're tired of unit converter apps that bury the conversion under five menus. • You want a clean, one-screen tool that respects your time and your data. • You prefer iOS native SwiftUI design over web-wrapped layouts. PREMIUM Unlock everything with a 3-day free trial, then an affordable subscription — cancel anytime. No ads, no tracking; works fully offline. — LEGAL — Terms of Use: https://web-levi.web.app/terms-of-use Privacy Policy: https://web-levi.web.app/privacy-policy — SUPPORT — Questions or feedback? Contact us at: tphuc.work@gmail.com