Someone prompt beats someone diligent, and you can be that with the reliable Healar - First aid, Sirens, Eye Test, Sight Dual mobile app. Since it features a lot of handy features, some of them even potentially life-saving, it is definitely a must-have for every phone. Fortunately, it is downloadable for free and is compatible with most Android devices.

The app comes with more than 30 first aid procedures, all of which are highly detailed and easy to follow. Furthermore, it contains various medical calculators, such as BMI, calorie, water intake, and more. It also features SOS functionalities that you can use in case of emergencies, like alarm sirens and flashlight blink sequences.