出國旅遊必備ＡＰＰ，常用旅遊英文100句APP is a free Android application that offers a collection of the most commonly used English phrases for travelers. The app also includes the emergency phone numbers provided by the Ministry of Foreign Affairs and is usable even without an internet connection. The content of the app is continuously updated based on the experiences of travelers.

In addition to this app, the developer, DavyZhen Dong, has also created other free English learning apps such as "300 Vocabulary Words for Elementary School Graduates," "300 Common English Phrases," and "Learning English through Radio Broadcasts." These apps are available for download in the developer's Facebook group. The app's team is from the Donghua University Information Workshop and can be contacted via email at

The app is a useful tool for anyone traveling to an English-speaking country and wants to communicate effectively. It is easy to use, and the content is informative. The app is ideal for those who do not have a reliable internet connection while traveling.