majors23
Major System Mnemonic Trainer
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Stop forgetting numbers. Start seeing them.
majors23 teaches you the Major System — a proven mnemonic technique that converts digits into consonant sounds, which you then turn into vivid words and images. Phone numbers, PINs, dates, historical years, mathematical constants: anything becomes a picture you can't unsee.
HOW IT WORKS
Each digit 0–9 maps to a phonetic sound. Two digits make a word. That word has an image. Your brain remembers images far better than abstract numbers — that's the whole trick.
FOUR TABS. ONE SYSTEM.
Reference
Browse all 100 number-image-word associations in a 5-column grid. Hide numbers, pictures, or words to self-test. Tap any cell to reveal it. Read aloud with built-in voice playback — hear the number and word spoken together at adjustable speeds. Double-tap anywhere to stop.
Generate
Type any sequence of digits and instantly see the matching image-word pairs. Perfect for encoding phone numbers, PINs, or constants like Pi and Euler's number. Copy the words or a learning prompt in one tap. Save any sequence with your own visual story sentence for later review.
Quiz
Test yourself in two directions: Number → Image or Image → Number. Choose multiple choice or type-in answers. Target any range of numbers, drill specific digit combinations with Matrix mode, or let the app automatically surface your weakest numbers in Difficult mode. Quit any time without affecting your stats.
Stats
Track accuracy and average response time for every number across both quiz types. Sort by any column to spot your blind spots at a glance.
FEATURES
100 hand-curated mnemonic images
Voice reading with number + word spoken aloud
Configurable quiz: range, matrix, or difficulty-based selection
Unlimited questions with automatic recycling
Persistent stats saved on-device
Day and night display modes
No account required — everything stays on your device
Whether you are preparing for a memory competition, trying to memorize your passport number, or just curious about how memory athletes think, majors23 gives you the full toolkit.
Start with 00. You will never forget Zeus again.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New matrix view of stats
The developer, JAE HO YOON, 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
- JAE HO YOON
- Size
- 146.3 MB
- Category
- Education
- Compatibility
Requires iOS 17 or later.
- iPhone
Requires iOS 17 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Jae Ho Yoon