Privacy Protected
No ads, no tracking, no data collection. All conversions stay on your device. No account required.
Six essential categories
Everything you need, nothing you don't.
Distance
Meters, feet, miles, kilometers, and more. Metric and imperial.
Weight
Grams, pounds, ounces, kilograms, stone, and metric tons.
Area
Square meters, acres, hectares, square feet, and more.
Temperature
Celsius, Fahrenheit, and Kelvin conversions.
Currency
162+ currencies with live exchange rates. Works offline with cached rates.
Cooking
Ingredient-specific conversions. Cups of flour to grams with accurate density.
See it in action
Tap any screenshot to enlarge. All 6 screens at a glance.
Built different. Built better.
Every feature designed with purpose and accessibility in mind.
Accessibility-First
Full VoiceOver support, Dynamic Type, haptic feedback, and high contrast. Built for everyone from day one.
Smart Conversions
Ingredient-specific cooking conversions with density calculations. Cross-category conversions that just work.
Fast & Efficient
Real-time conversions as you type. Conversion history, favorite categories, and smart search.
Finally, a converter that speaks your language
Built for blind and low-vision users from the very first line of code.
- Full VoiceOver support with clear announcements
- Dynamic Type from small to accessibility sizes
- Multi-sensory feedback: visual, haptic, and audio
- Minimum 44pt touch targets exceeding guidelines
- Reduce Motion support for sensitive users
Frequently Asked Questions
Quick answers to common questions.
How do I convert units?
Select a category from the home screen, enter a number, choose your "From" and "To" units using the dropdowns, and see your result instantly at the top of the screen.
How do currency conversions work?
Currency rates are updated daily when you have an internet connection. The app automatically detects your locale to set default currencies. Once rates are downloaded, they're cached so you can convert currencies offline using the last known rates.
Why does my cooking conversion say "(approx)"?
Cross-category conversions between volumes (cups, tablespoons) and weights (grams, ounces) use density estimates because different ingredients have different weights. For the most accurate results, use ingredient-specific cups like "Cup of Flour" or "Cup of Sugar" which have precise density values.
How do I clear my conversion history?
Go to Settings > History Limit and select a lower number to automatically trim older entries. To clear all app data, go to iOS Settings > Flip Unit > Clear Data, or simply uninstall and reinstall the app.
How do I change the app theme?
Open the Settings tab and tap Theme. Choose from System (follows your device setting), Light, or Dark mode.
How do I add categories to favorites?
On the home screen, swipe left on any category card to reveal the favorite option. Tap the star icon to add it to your Favorites section at the top of the home screen.
Does the app work offline?
Yes! All conversions work completely offline. Currency conversions use cached exchange rates from your last online update. All other categories (Distance, Weight, Area, Temperature, Cooking) work offline without any limitations.
How many currencies are supported?
Flip Unit supports 162+ world currencies with exchange rates provided by ExchangeRate-API. Rates are updated daily when you're connected to the internet.
Is the app accessible?
Absolutely! Flip Unit is built accessibility-first with full VoiceOver support, Dynamic Type scaling, haptic feedback, Reduce Motion support, and high contrast colors.
Why are some results in scientific notation?
Very large numbers (over 1 million) or very small numbers (under 0.001) are displayed in scientific notation for better readability. For example, 1,500,000 may display as 1.5e6.
Does Flip Unit collect my data?
No. Flip Unit collects absolutely no personal data. All conversions happen locally on your device. See our Privacy Policy for full details.
Is there an Android version?
Flip Unit is currently available only for iOS (iPhone). There are no plans for an Android version at this time.