# Rosetta: Unit Converter — Offline currency & measurement

> Offline currency & measurement (iPhone/iPad app by Optiwise.)

- Source: https://appshunter.io/ios/app/rosetta-unit-converter/id6766109378 (this page in markdown: same URL + `.md`)
- Developer: [Optiwise](https://appshunter.io/developer/1559472272)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 15.1 · 35 MB
- Languages: American English
- Released: 2026-05-08
- Data updated: 2026-05-26
- User reviews in markdown: https://appshunter.io/ios/app/rosetta-unit-converter/id6766109378/reviews.md

## What is Rosetta?

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


## Version history (last 1 release)

### 1.0 — 2026-05-08

No release notes.

## More apps by Optiwise

- [FamilyCart Groceries](https://appshunter.io/ios/app/familycart-groceries/id6753196717)
- [Nibble AI - Calorie Tracker](https://appshunter.io/ios/app/nibble-ai-calorie-tracker/id6756195763)

All apps by Optiwise: https://appshunter.io/developer/1559472272

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-26.*