UM Rejseklar is a free Android app developed by Udenrigsministeriet, designed to help travelers be well-prepared and safe while traveling abroad. The app provides direct access to travel guidelines for countries all over the world, along with useful information and advice on passport and visa requirements, as well as what to do in case of emergencies such as illness, robbery, or arrest.

One of the app's key features is the ability to easily sign up for the "Danskerlisten" for the country you're visiting or residing in, which allows the Ministry of Foreign Affairs to contact you personally in case of a serious crisis, such as a natural disaster or terror attack. You can also receive emails, SMS, or push notifications from the Ministry of Foreign Affairs during crisis situations with information on how to respond. The app also provides contact information for the nearest Danish embassy or consulate in case of emergencies, as well as contact information for the Ministry of Foreign Affairs' Global Operations Centre, which operates 24/7.

Overall, UM Rejseklar is an indispensable travel companion for Danish travelers and residents abroad, providing them with the information and resources they need to stay safe and informed during their travels.