Here's a nifty product that fills a social need: it's a FREE app that calculates when or if you should drive.
While you may think the idea is hokey (or a big "no duh"), it's biggest draw is that it's fun to use, even in a crowd at a bar. What could be better than that?
For one "tester", the app proclaimed, "don't even think about it." While she was surprised at the time (read: the normal impaired-judgment effect of alcohol), her hangover the next day confirmed the app's assessment.
But the best part of all?
"When she pulled out the iPhone app at a bar the other night, her friends all clamored to take a turn - and the subject was suddenly very much on the table.
Another advantage: people may be more apt to listen to her phonethan to a friend who tries to take away her keys.
For some, the app 'feels very solid and mathematical and trustworthy, and nonjudgmental.'"