A colorful calculator with BIG buttons, LOTS of features, and fully customizable. This version is ad-supported. ・Dual-line display - shows the input and result at the same time ・History tape - saves every calculation, time and date stamped ・Memory buttons - shows its value on the display ・Percentage and backspace button ・Scientific functions ・6 layouts (3 portrait, 3 landscape) ・10 color themes ・Multi-line input for really long equations ・Automatic scientific formatting ・Label any calculation in the history tape ・E-mail a calculation or the entire history tape ・VoiceOver accessibility ・iOS 9 Split View ・3D Touch Gestures ・Swipe down to see the history tape ・Tap & hold on the result to copy ・Tap & hold on the input to move the cursor, copy, paste, convert to E-notation Customize ・Font Size ・Bold Font ・Color Theme ・Light Tape Background ・Show Layout Button ・Allowable Layouts ・Show Memory Buttons ・Backspace Button (Solid, Arrow) ・Replace ÷ Button With / ・Replace E Button With Hidden, EE, 00, or 000 ・Show Thousands Separators ・Minimum Decimal Digits ・Maximum Decimal Digits ・Sound ・Equals Repeat ・Left-Handed Mode URL Scheme: calculatorhdprofree://