Waterful is a free iPhone app that helps you track your daily water intake and reminds you when it's time to drink. The app is designed to help you develop healthy habits by providing drinking alarms and many other useful features. With this app, you can calculate your daily goal, get regular reminders, choose from a base of default drinks or create a custom one, take challenges and collect badges, and use widgets to add drinks even quicker.

Waterful also offers Apple Health Integration, Siri Shortcuts, and Apple Watch support to make it more convenient for users to track their water intake. The app helps you stick to your diet, detox your body, clear up your skin, fill up on much-needed minerals, lower stress, avoid bladder infections, boost energy, prevent kidney stones, and increase brain power.

Overall, Waterful is a great app for those who want to develop a better water drinking habit and live a healthier life. If you have any feedback or suggestions, you can contact the developer at