Unit Master - Trivia & Facts
Measurement & Conversion Quiz
$1.99 · Designed for iPad. Not verified for macOS.
280+ trivia questions about the world's units — metric, imperial, nautical, Japanese traditional, and more. One-time purchase, no ads, no subscription.
Unit Master turns the world's units of measurement into a fun trivia and facts quiz for the whole family.
Discover where the mile, the nautical knot, the Japanese shaku, the hectare, and dozens of other units came from — and test yourself with 280+ multiple-choice questions across 13 categories: length, weight, volume, area, speed, temperature, time, data, pressure, energy, astronomy, logarithmic scales (like the Richter scale and decibels), and quirky one-off units.
FEATURES
• 13 categories covering metric, imperial, nautical, Japanese traditional (shaku/kan/go), and scientific units
• An Elementary level for units kids actually learn in school, plus an Advanced level for the trickier stuff
• A dedicated "Conversion Only" quiz mode if you just want to practice converting between units
• Every wrong answer explains what you actually picked, not just what was right
• A separate Study tab lets you browse every unit's origin and a fun fact, with no quiz pressure
• Track your best score per category
• One-time purchase — no subscription, no ads, no account required
Whether you're brushing up before a trip, helping with homework, or just enjoy trivia night, Unit Master is a lightweight way to learn something new about the units all around you.
Content is compiled for entertainment and general-knowledge purposes; while we aim for accuracy, some origin stories and comparisons are simplified or debated. Please don't rely on it for anything that requires precise, verified figures.
Questions or feedback? santamaru-app@gmail.com
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The developer, SHOTA KATAYAMA, 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
- Seller
- SHOTA KATAYAMA
- Size
- 2 MB
- Category
- Trivia
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - iPad
Requires iPadOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Shota Katayama
