It is very interesting when you have chance to show off your skills. It can lead you to see if you are lacking some, improve some or see that you are leader in the field.
Visualising the skill set with app can give you motivation to improve. You can compare yourself, have fun or be more competitive.
HR menagers would add employees' skills (depending on field of work, group of main skills are selected) in your profile on app. Employees will get individual current state of skill set visualized with diagram. It can be seen as a CV or level of knowledge, shown in a simple diagram. Employees will be able to see others skills, which can lead to better communication, support in learning & improving and sharing your interest in other's skills you wish to learn.
How would you stage or advertise your hack?
Working environment will get simple tool for better communication of employees. Both in competitive way for more learning, but also in a mutual support and motivation.