A free app for Android, by ARTwareSoftware.

OnTime Clock is a live wallpaper clock that displays the current time on your home screen. You can choose from a variety of clock styles and even have the option to add an icon to your home screen that shows the current time in seconds. You can also choose from a variety of themes to make your home screen look unique. The free version of the app comes with two styles, a minimal and modern style. The free version of the app is free to download.

If you want to make the clock even more interactive, you can add an icon to your home screen that shows the current time in seconds.