Rosetta
Translate measurements instantly.
Rosetta converts length, mass, temperature, volume, speed, area, time, energy, power, pressure, data, angle, and currency with a two-way interface built for quick checks. Core categories work fully offline. Currency uses live rates from the Frankfurter API when you refresh, then caches the rates locally with an as-of timestamp. Favorites stay on your device, tap-to-copy stays quiet, and Rosetta uses no accounts, analytics, ads, in-app purchases, notifications, or tracking.
Coming to Google PlayApp Preview
See Rosetta in Action
How It Works
Fast from either side
Rosetta treats both values as first-class inputs so quick conversions stay quick.
Pick a category
Start with a common offline category or open Currency when you need exchange rates.
Enter either value
Type on the left or right side. Rosetta recalculates the other side immediately.
Save favorites
Star recurring conversions so they stay available from the home screen.
Copy quietly
Tap the inactive value to copy it with a small confirmation and no extra UI.
Who It's For
Built for Your Lifestyle
Travelers
Convert distances, speeds, temperatures, and cached currency rates without relying on constant signal.
Students
Check everyday science, math, and data units without account setup or distractions.
Makers
Move between measurements quickly while cooking, building, designing, or repairing.
Privacy-minded users
Use a utility app that stores favorites locally and avoids analytics or advertising identifiers.
Features
What Makes Rosetta Special
Twelve offline categories
Convert length, mass, temperature, volume, speed, area, time, energy, power, pressure, data, and angle without a network connection.
Currency with cached rates
Refresh live currency rates from the Frankfurter API, then keep converting offline with a visible as-of timestamp.
Two-way input
Tap either side of a conversion to make it active. The other side recalculates instantly.
Ten smart favorites
Star frequently used conversions and keep up to ten favorites on the home screen, ordered by use.
Tap to copy
Tap the inactive result to copy it and get a discreet confirmation without menus or popovers.
No tracking
No accounts, analytics, advertising SDKs, crash-reporting services, social login, or embedded media.
Ready to try Rosetta?
Rosetta is coming to the App Store and Google Play. Until then, preview the privacy-first converter experience.