The free and paid versions of Calculator² have been combined into a single, universal app. This version of the app will be removed from the Store on 31/07/2014. Please download the universal app to continue receiving updates. Features: • over 50 scientific functions • 125 mathematical and physical constants • statistical functions for memory values • over 150 World currencies • over 300 units for conversions across 26 categories • searchable constants, currency, and units lists • calculation history • Undo function • customisable Tax buttons • customisable button layout • Auto, Fixed point, Scientific, and Engineering display formats with choice of digit grouping • enable or disable operator precedence • copy/paste • support for both light and dark themes, and use of the accent colour • live tiles for each calculator showing the history or latest exchange rate • 64, 32, 16 and 8 bit word lengths for the Programmer Calculator, including signed or unsigned integers