Koin - Exchange Rates
Fastest Currency Converter
Free · Designed for iPad. Not verified for macOS.
Koin is the currency converter built for travelers who just want to know what something costs in their money.
Open the app, type the amount, see the result. That's it.
HOW IT WORKS
Set your home currency once during onboarding — the currency you think in. Then pick the currency of wherever you're traveling. Koin shows you the conversion in real time as you type.
FEATURES
• Instant conversion as you type
• 150+ currencies from every corner of the world
• Daily exchange rates, cached for offline use
• Swap currencies with one tap
• Searchable currency list — find by name, code, or country
• Comma or period decimal format — your choice
• Haptic feedback for a satisfying, tactile feel
• Clean, distraction-free design
BUILT FOR TRAVEL
Whether you're checking a price tag in Tokyo, splitting a bill in Berlin, or haggling at a market in Marrakech — Koin gives you the answer before the moment passes.
PRIVACY
Koin does not collect personal data. Exchange rates are fetched from ExchangeRate-API. Your currency preferences are stored only on your device.
Ratings & Reviews
- Favorite Currencies
- Minor Fixes
The developer, Alec Winter, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Alec Winter
- Size
- 34.8 MB
- Category
- Travel
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
00+
- 00+
- Copyright
- © 2026 Alec Winter