New version: support Apple Watch!
What you really need, is this running fast, simple, elegant calculator

Features:
- Super big button
- Backspace key
- View and edit history of your calculations
- Basic Calculations (+, -, ×, ÷, %, 1/x, ^, Abs)
- Retina display (new iPad & iPhone4, 4S, 5, 5S, 5C,6,6 Plus)
- Use both calculators in portrait or landscape mode，except iPhone

What are you waiting for？ Just Download it！