Jabr Pro: Calculator

Jabr Pro is an all-in-one scientific and engineering calculator app, built to replace multiple scattered math and engineering apps with a single, elegant tool. It pairs a clean, intuitive interface with a powerful calculation engine designed for students, engineers, and math enthusiasts alike.

The app includes a full-featured scientific and engineering calculator (with a programmer mode for number systems), a step-by-step equation solver, and an interactive 2D and 3D graphing engine. It also offers a complete geometry toolkit (areas, perimeters, triangle solving, coordinate geometry, vectors), a probability calculator, a comprehensive unit converter, and a text-to-Unicode math symbol converter.

The app keeps a calculation history, supports customizable themes, and is available in eight languages including full right-to-left Arabic support — running on iPhone, iPad, and Mac. Pricing is a 3-day free trial followed by a one-time purchase for lifetime access, with no recurring subscription.