This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.
Rule of Three Calculator by Saran Dumronggittigule


13+ similar apps compared and reviewed
Whether you want more options like N+Motion or a completely different take on the same concept, our curated list of 13+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.


This utility app helps you solve problems involving ratios and proportions. It calculates an unknown number based on the relationship between two other known numbers.



This app provides comprehensive mobile services for campus cards, including traditional card functions like consumption and authentication, enhanced with QR code capabilities. It offers features for managing your campus card, paying various campus fees, and booking campus facilities.




Easily determine the capacity of structural steel beams and columns. Get detailed calculation sheets to verify your work, designed according to AISC 360-16 standards. Features intuitive touch-based interaction and built-in material databases.


Interact with a multi-sensor IoT device to capture and view environmental data, motion, and audio. Control the device's LED, speaker, and trigger events through a user-friendly interface without needing programming skills.


This app provides live vibration test monitoring and analysis by connecting to specific hardware. It also includes a suite of engineering calculators, a noise meter, an accelerometer, and a strobe light for various testing and measurement needs.


This utility app allows for the configuration of a 32-bit ARM processor-based device with integrated sensors. It automatically recognizes various radio systems and enables parameter setting via a mobile app or computer software.


Transform your phone into a handheld oscilloscope for detailed audio signal analysis. Professionals can also use it for circuit measurements. Features include precise frequency measurement, multiple trigger modes, and gesture-based zooming.


This app uses your device's magnetometer to detect magnetic and electromagnetic fields. It helps locate metal objects, hidden wires, pipes, and even wood studs behind walls. Get real-time readings and alerts to explore your surroundings.


Diagnose your mobile device's status with this comprehensive tool. Access real-time data from all supported sensors, including motion, environmental, and hardware information. Test sensor functionality and view data graphically or in text format.