The slim band fits around your wrist like any of the fitness trackers on the market, but instead of tracking your motions with an accelerometer, Proof reads alcohol molecules through your skin. Your friends at the bar may think you’re checking your phone, but instead you’re seeing if you’re sober enough to drive home. In addition to tracking your current level, Proof can predict how drunk you’ll be later in the night.
The app also has a friends feature that’s invite only, so that you can track your loved ones that are out for the night and make sure they’re drinking responsibly.
While the tracker could unfortunately be used as a competition to see who gets the drunkest, CEO and founder Evan Strenk tells Mashable that he wants to, “empower people to make educated decision about alcohol.”
According to Proof’s website, the band uses disposable cartridges to ensure, “reliable alcohol tracking for over 12 hours.”