A free app for Android, by LiChunWei.

Screen Translator is a powerful application for your Android devices that can translate the entire screen into any language. It can also translate photos and games. Thankfully, Screen Translator doesn’t need an internet connection to translate texts, saving you the hassle of having to enable your WiFi or mobile data.

You can also save translated texts for your reference, which makes the app ideal for globetrotters and international students. Screen Translator currently supports over a hundred languages, including Afrikaans, Simplified Chinese, Traditional Chinese, Filipino, Japanese, Mongolian, Russian, Swedish, Thai, and more.