The application was built in C and Win32 API.
And it then was packaged as a UWP application on Visual Studio.

The wall clock series is software for Windows Operating System.
These applications are currently only available for devices with CPUs of the x86-64 architecture.
Depending on the version of the Windows Operating System, the software may not be available.
We recommend that you try Wall Clock Light once, which is available free of charge, to ensure that the application works properly in your computer environment before purchasing a paid version of our applications.

For more information, see the installation requirements for the relevant software listed in the Microsoft Store.