goRPN vs Unit Converter

goRPN is an RPN calculator, with a stack modeled on the HP-16C. It is currently quite minimal, but will eventually adopt more of the functionality of the 16C. goRPN is open-source software. If you would like to contribute, get the source at https://www.github.com/joel-perry/goRPN

Unit Converter is a powerful yet simple conversion tool that handles all your everyday measurement needs. With 16 built-in categories and a custom on-screen keypad, converting between units is fast and effortless. CATEGORIES: - Length (meters, kilometers, miles, feet, inches, yards, nanometers, and more) - Weight / Mass (kilograms, pounds, ounces, grams, stones, carats, troy ounces, micrograms) - Temperature (Celsius, Fahrenheit, Kelvin) - Volume (liters, gallons, cups, fluid ounces, milliliters, Imperial UK gallons/pints/fl oz, cubic feet, cubic inches) - Speed (m/s, km/h, mph, knots) - Energy (joules, calories, kilocalories, watt-hours, kilowatt-hours, BTU) - Power (watts, kilowatts, horsepower, BTU/hour) - Pressure (pascals, bar, PSI, megapascals, atmospheres, mmHg) - Force (newtons, kilonewtons, pounds-force, dynes) - Area (square meters, acres, hectares, square feet) - Time (seconds, minutes, hours, days, weeks, years) - Frequency (hertz, kilohertz, megahertz, gigahertz, terahertz) - Angle (degrees, radians, arcminutes, arcseconds) - Fuel Efficiency (L/100km, MPG, MPG UK, km/L) - Data Storage (bytes, bits, KB, MB, GB, TB, PB, plus binary KiB, MiB, GiB, TiB) - Battery Charge (mAh, Ah, coulombs) FEATURES: - Custom numeric keypad designed for fast input - Instant real-time conversion as you type - All Units view — see your value in every unit of a category at once - Copy and paste — tap any result to copy it, or paste a number straight into the input - Live rate hint that shows the exact conversion factor (for example, "1 mi = 1.609 km") - Animated swap button to quickly reverse the conversion direction - Remembers your last category and unit between launches - Optimized landscape layout on iPhone and a clean, centered layout on iPad, with hardware keyboard support on iPad - Powered by Apple's native Measurement APIs for accuracy PERSONALIZATION: - Choose between System, Light, or Dark theme - Pick from 9 accent colors to match your style - Toggle haptic feedback on or off ACCESSIBILITY: - Full VoiceOver support that speaks each value and unit - Numbers respect your region's decimal separator - Dynamic Type scaling throughout PRIVACY FIRST: - No account required - No data collection or tracking - No ads or analytics - Works completely offline - Your preferences stay on your device Built with SwiftUI for a fast, native iOS experience. Built by Approve The Move — genuinely useful apps, always free, no subscriptions.