All charts pro- Calculations and reference for power system design in commercial buildings.
The pro version of AllCharts has lot more additional features, such as:
Wire ampacities with derating and temperature correction
Grounding Tables
Conduit spacing and knockout diameters
It has additional functionality for conduit fill, voltage drop and motors than what the free version offers.

It also enable the user to screen capture the result page and share it via email, SMS etc.