CalcExp is designed as an alternative to the system build-in calculators. CalcExp runs on Windows 2K/XP/Vista, MacOsX, Linux, and Solaris. The main features are:

1. All-in-one Calculator:
Can be a good alternative to the system build-in calculators and hand-hold calculators. It makes your calculating faster and safer.

2. Powerful Number formatting:
You have many options to choose for formatting the result number, such as: Locales, Fraction Digits, Scientific Notation, Hexadecimal Displaying, etc, while the windows calculator can't do that for you!

3. Friendly User Interface:
Want it always stand on top? or want hide it as a systray icon? yes, you can do that.
Want unlimited undo/redo when editing the expression? Just press Ctrl+Z/Ctrl+Shift+Z.
Want record an expression, then recall it later? Save it in history list.

4. Skin Changeable:
7 Skins(themes) created by professional artists; the font is clear and easy to read.

5. Web Launch:
revolutionary startup manner: Web Launch. It allows you launch CalcExp in a web browser! With just one click, you can install/launch CalcExp on your computer, whatever you working on Windows, Linux, MacOsX, or Solaris.

6. Easy to Use:
View and Edit the expression directly; Avoid making mistakes to it.

7. Custom Functions:
You can define your own Functions and Constants, and use them later like system build-in functions/constants. It saves time and help you work more efficiently.

8. Fully Tested and Safe:
It has passed more than 1141 test cases to make sure your calculation is safe. It comes with a set of Bug Tracing Mechanism to help find any exceptions in calculating and report them to fix at once. This makes CalcExp become safer and safer.

9. Useful Tools:
A great feature of CalcExp is the useful tools, there are good friends in your work. There are 4 useful tools in CalcExp:Unit Converter, Currency Converter, Statistics Calculator, and Color Converter.