Unit Converter-Free & Easy
Currency Length Weight Volume
Free · In-App Purchases · Designed for iPad
20 languages·Live rates·Offline·Rating prompt now live
ConvertMaster is a completely free, ad-free unit converter.
Launch and go. No sign-up. No data collection.
All 40 categories are permanently free. No paywalls.
ALL FEATURES FREE FOREVER:
• 40 categories — currency, length, weight, area, volume, temperature, speed, time, pressure, energy, power, data storage, cooking, angle, fuel, force, torque and more
• 200+ currencies with live exchange rates, updated hourly
• Currency picker with search — find any currency instantly
• Multilingual currency names (CLDR standard)
• Home page ranks categories by your usage frequency
• Restores your last-used category on launch
• Batch convert — enter multiple values, see all results instantly
• CSV export for batch results
• Metric and imperial side by side
• Scientific notation for extreme values
• Dark mode
• 100% offline (except live currency rates)
No account. No sign-up. No data collection.
No internet required (except live rates).
Most converters limit their currency list or lock categories behind paywalls.
ConvertMaster gives you everything — 200+ currencies with search, 40 categories — all for free, forever.
Voluntary support available in app — optional, never nagged.
No data collected. No tracking. No sharing.
Your numbers, on your device only.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
Added rating prompt — if you love CM, please leave us a review!
The developer, 磊 刘, 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
- 磊 刘
- Size
- 26.3 MB
- Category
- Utilities
- Compatibility
Requires iOS 13.0 or later.
- iPhone
Requires iOS 13.0 or later. - iPad
Requires iPadOS 13.0 or later. - iPod touch
Requires iOS 13.0 or later. - Mac
Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
English and 2 more
- English, Simplified Chinese, Traditional Chinese
- Age Rating
9+
- 9+
- In-App Purchases
Yes
- Unit Conversion Pro Edition USD 6.99
- Unit Conversion Standard Version USD 3.99
- Copyright
- © 2026 LIULEI