3D World Time is a free Android app developed by Jupiter Apps that helps users keep track of time around the world. The app displays the current time of different cities on a 3D globe, with cities shown in yellow if currently in daylight and blue if in the dark. The line length is proportional to the city's population, making it easier to identify heavily populated areas.

The app is user-friendly, allowing users to spin the globe and pinch to zoom in and out. It also offers an in-app payment option for users who want to remove ads and support the developer. In case of any issues, the developer provides support via email, requesting users to provide their device, OS version, and a full description of the problem.

Overall, 3D World Time is a handy tool for anyone who needs to keep track of time across different time zones. It is easy to use, informative, and free to download from the Google Play Store.