This is THE BEST calculator for iOS with big buttons and colorful backgrounds! This version is ad supported.

・Dual-line display - shows the input and result at the same time
・Percentage and backspace button
・18 color themes
・Multi-line input for really long equations
・Automatic scientific formatting
・VoiceOver accessibility
・Split View

Gestures

・Swipe left on the display to backspace
・Swipe right on the display to clear
・Tap & hold on the result to copy
・Tap & hold on the input to move the cursor, copy, paste

Customize

・Color Theme
・Sound

URL Scheme: bigcalculatorpro://