Main Features of Free Edition:
1.Expression input by both keyboard and inbuilt buttons.
2. Show all the calculation history.
3. Multi-functional calculation.
4. Calculation history can be saved into files.
5. Step by step traceability.
6. Personal function definable.
7. Input syntax checking.
Main Features of Standard edition:
1. Include all the features in the free edition.
2. Xmart Converter inbuilt. Containing most common convertions for base, PC memory, speed, length, area, volume, weight and temperature.
3. Unlimited update. Purchase one product key and use it for all the on-coming versions.
4. 30-day trial. No fee untill you are satisfied.
5. Unlimited custom functions. You can only define a limite number of functions in the free edition( the size of the file must smaller than d 1 kb)
6. Define a static value of a fuction.
7....