HP 15c Calculator vs Plus42

Meet the next generation of your favorite scientific calculator. The official HP 15c app, now brings a completely redesigned interface, a modern look, and improved functionality—while preserving the precision and reliability trusted by professionals for decades. This RPN calculator offers the features, algorithms and calculation sequences of the original 15c Scientific Calculator conveniently stored on your iPhone or iPad. The HP 15c You Know – Now Better Than Ever • Official emulator of legendary calculator device by HP • Identical algorithms, layout, and keystrokes as the original HP 15c • RPN (Reverse Polish Notation) for fast and efficient input • Matrix calculations, Complex functions, Numerical integration. • Ideal for math and engineering students and professionals • Programmable – up to 448 lines Be Ready. Anywhere. Anytime. Whether you’re in class, at the office, or on the go, HP 15c is ready when you are. Just launch the app on your iPhone and get to work. Download HP 15c today and experience the perfect blend of classic functionality and modern design.

Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever. Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.