Calculator HD Pro

A colorful calculator with big buttons, comprehensive features, and extensive customization. Used by millions. Completely ad-free.

SEE EVERY STEP
・Dual-line display - shows your input and result simultaneously
・Multi-line input for long equations
・Tap & hold to move the cursor or copy and paste where you want

SAVE YOUR WORK
・History saves every calculation with time and date
・Label important calculations for easy reference
・Email single calculations or complete history
・Swipe down to review previous work

CUSTOMIZE EVERYTHING
・6 layouts including extra-large button options
・10 color themes plus Dark Mode
・Adjustable font size and bold text
・Left-handed mode
・Show or hide features you don't need

SCIENTIFIC FUNCTIONS
・Full scientific calculator when needed
・Memory buttons with values displayed
・Percentage and backspace buttons
・Automatic scientific notation
・VoiceOver accessibility

OPTIONAL IN APP PURCHASES
・Today View Widget (iOS 17 and below)
・Multiple History Tapes

ADDITIONAL FEATURES
・Customizable button symbols and decimal settings
・Multiple backspace button styles
・iPad Split View and 3D Touch support
・Gesture controls for quick access

URL Scheme: calculatorhdpro://