Your iPhone can help you find a good brunch place, with reviews on Yelp that indicate a restaurant’s best dishes. But there really isn’t any real-time help, except maybe calling or taking your chances and just showing up, to find out if you and your friends can get a table at a local hot spot.
A company called Density has developed a door-frame sensor that monitors the coming and going of people and then reports to an iPhone app whether your favorite place is full. It collects data on people’s movement at various hours of the day and recommends windows of time when you can get right in.