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TLA Systems Ltd.
PCalc is the powerful choice for scientists, engineers, students, programmers, or indeed anybody looking for a feature rich calculator. It includes an optional RPN mode and multi-line display, a choice of button layouts, an extensive set of unit conversions and constants, a paper tape, multiple undo and redo, engineering and scientific notation, as well as support for hexadecimal, octal, and binary calculations.
BA Financial Calculator Pro
Vicinno Soft LLC
Full-feature emulates Texas Instruments BA II Plus Professional Financial Calculator for iPhone, iPad, and Apple Watch. Built with identical algorithms and formulas of original, it provides exact same capabilities and operation sequences, and beyond with better user experience.