A free app for Android, by Tasty Blueberry Pi.
The app works in three phases. The first is the creation of a photo copy. The second is the placement of a timestamp on the photo copy. And the third is the combination of the two elements into an image.
All of this is done in a very user-friendly way, and the result is saved into a folder on your device. The app also allows you to share the photos with your friends and family.
You can use it on any Android device and it will work on the latest Android releases. It is a very simple and easy-to-use tool.