Chess Clock App vs Plus42

A chess clock consists of two connected clocks which can't run at the same time. Use it as a game clock to measure the time used by two players for their moves e.g. in game of chess. Stopping one clock will start the other one. The purpose is to keep track of the total time each player takes for his or her own moves, and ensure that neither player overly delays the game. Features: - choose the same time for both players or individually - count the time down or up - pause the clock for both players - runs in the background while the app is closed - support for the iPhone 6 and 6+

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.