LitterLotto is a free Android app that encourages users to clean litter and earn prizes in return. The app's built-in camera function lets you take a picture of the litter you just binned and earn an entry into the prize draw. The more litter you bin, the more entries you get, and the higher your chances of winning one of the spot prizes or the monthly jackpot. The app partners with brands that share their passion for eliminating litter to fund the prizes. You can even invite friends to start binning litter using the app and increase your chances of winning. The personal data you share with the app is never sold and is only used for research purposes. The app also lets you track your progress and see how much of an impact you've made on the environment.