NumJam: The Musical Calculator
Musical Calculator Keyboard
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Turn every tap into a note. NumJam blends a smart calculator with playable instrument sounds, recording, and classic or scientific layouts.
NumJam: The Musical Calculator turns everyday calculation into something you can play.
Use a classic calculator while every tap triggers a musical note. Build equations, tap rhythms, switch between free sounds, and turn numbers into small musical ideas. NumJam is made for quick math, playful sound, and anyone who wants a calculator that feels more alive than a normal keypad.
Free Features:
• Classic calculator for everyday math
• Multiple calculators on iPad - Up to 2 classic calculators
• Musical notes mapped to calculator buttons
• Free instrument sounds
• Mute sound anytime from the header
• Clean layouts for iPhone and iPad
• Fast tapping for musical play
NumJam Pro Features:
• Scientific calculator
• Multiple calculators on iPad - Up to 4 calculators
• Full instrument library
• Recording tools for calculator performances
• Save and replay your MiniPlay recordings
• Pro layouts and sound options
• More ways to build rhythms, patterns, and musical calculator ideas
NumJam works as both a calculator and a playable sound pad. Use it for simple math, experiments, patterns, rhythms, or just turning numbers into music.
Subscription and Purchase Information:
NumJam offers optional premium access through auto-renewing subscriptions and a lifetime purchase. Available options may include a monthly subscription, yearly subscription, and one-time lifetime unlock. Prices are shown in the app before purchase and may vary by region.
Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. Your account may be charged for renewal within 24 hours before the end of the current period. You can manage or cancel subscriptions in your App Store account settings after purchase. If a free trial is offered, it will convert to a paid subscription unless canceled before the trial ends.
Privacy Policy: https://plenguyen.com/numjam/privacy-policy
Terms of Use:
Apple Standard End User License Agreement
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Key taps now flash on press — easier to follow in screen recordings
• Improved performance and responsiveness when playing notes rapidly.
The developer, Le Nguyen, 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
- Le Nguyen
- Size
- 11.1 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 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 and 2 more
- English, Simplified Chinese, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- NumJam Pro Yearly $4.99
- NumJam Pro Lifetime $5.99
- NumJam Pro Monthly $0.99
- Copyright
- © 2026 PLE NGUYEN