The answer is not straight forward.  HCI recommends accessing the Compensation Tool through a Google Chrome browser on a large screen.  Although you may be able to access the tool through your mobile or alternative browsers, HCI does not support these and has only thoroughly tested the Tool in the Google Chrome (non mobile) browser window.  Accessing the tool through alternates may have an impact on data being entered and thus affect your Pay Equity Plan. 

As the tool is table driven and usually displaying significant amounts of data it is not recommended for use over a mobile device and has no plans to be become a mobile app.