Calculus Volume 1: Textbook, developed by RK Technologies, is an Android application designed for students studying general calculus. The app offers a comprehensive guide to the basic concepts of calculus, with a focus on how these concepts apply to real-life situations. The app is divided into three volumes, with Volume 1 covering functions, limits, derivatives, and integration. With a user-friendly interface, the app offers a detailed and well-organized course overview, including tables of integrals and derivatives, and a review of pre-calculus.

The app's contents include a review of functions, basic classes of functions, trigonometric functions, exponential and logarithmic functions, limits, continuity, derivatives, differentiation rules, rates of change, and applications of derivatives. The app also covers integration, including approximating areas, the definite integral, the fundamental theorem of calculus, substitution, integrals involving exponential and logarithmic functions, and applications of integration. The app's course overview is well-organized, and the app is easy to use, making it an ideal resource for students studying calculus.