The "さしご 簡単三角計算機" is a straightforward triangle calculator app designed for quick and easy triangle calculations. Developed by Kura-chin, this free Android app falls under the Business & Productivity category. The app's name originates from the construction site practice of using the 3:4:5 triangle ratio to determine right angles, known as "さしご" in Japanese.

This app differentiates itself from others by offering simple operations for trigonometric functions and the Pythagorean theorem. Users can easily input side lengths or angles by touching the desired element and using numeric keys, followed by the [Enter] key. The app calculates the remaining values based on the input and allows users to modify values continuously with the priority memory feature.