Who doesn’t like to go to a nice restaurant or a bar or a party to get a nice glass of wine or a bottle of beer and to take a break from the busy life? After eating and drinking for a couple of hours, it’s time to go home. Now we need to make a decision on whether to drive home or to take the Uber. Us human beings are sometimes arrogant and ignorant. We think the alcohol has worn off and we are sober enough to drive a car. Sometimes, our instinct is correct. Sometimes, we get pulled over just to realize that we are actually not sober enough to drive. We all have only one chance to live. According to BACtrack, about 28 people die from drunk driving crashes every day. To help people make wiser decisions and to save lives from drunk driving accidents, we decide to create an iPhone app that provides the users an approximation on whether they are sober enough to drive a car.