Flip Calculator is a simple math calculator designed for convenient one-handed operation with closed flip. The flip keypad is used to input both digits and functions. Math functions are accessed by holding down the assigned keys, aided by the on-screen key map for easy visual reference.

Major features include:
- Large digit numeric display
- Animated key map for visual feedback on key usage
- Digit and function input solely via the flip keypad
- Math functions accessed by holding down the assigned keys
- The four base operations (add, subtract, multiply, divide)
- Extra operations: percentage, square, square root, reciprocal, logarithm
- Selectable function sets (common, trigonometric).
- Memory store, restore, clear
- Copy and paste numbers to/from other applications
- Adjustable colors for the numeric display
Upgrades within one major version (e. g. 1.00 to 1.90) are free for registered users.