Rosetta: Unit Converter

Translate measurements instantly. A calm, ad-free unit converter for everyday checks — currency, weight, length, temperature, and ten more categories.

Tap either side to make it the active value; both cards are first-class, so you can convert in either direction with one tap. Star up to ten favorites for one-tap reuse from the home screen. Currency rates come from the European Central Bank — cached after your first fetch, so they keep working offline.

THIRTEEN CATEGORIES
• Currency — 165 ISO currencies, ECB-sourced rates
• Length — meters, feet, miles, kilometers, yards, inches
• Mass — grams, kilograms, pounds, ounces, stones
• Temperature — Celsius, Fahrenheit, Kelvin
• Volume — liters, gallons, cups, fluid ounces, milliliters
• Speed — m/s, km/h, mph, knots
• Area — m², ft², acres, hectares
• Time, Energy, Power, Pressure, Data, Angle

WHY ROSETTA IS DIFFERENT
• No ads. No tracking. No accounts. No analytics SDK ships in the app.
• No settings to configure. The defaults are the right defaults.
• Works offline. Currency rates cache after one online fetch; everything else needs no network at all.
• Two-way input — convert in either direction with a single tap.
• Tap any result to copy. A quiet "Copied" toast confirms.
• Light and dark mode automatic, with locale-aware number formatting and gentle haptics.

Free. Forever free. Made by Optiwise.

Support: contact@optiwise.us
Site: rosetta.optiwise.us