Foursquare is an app that lets you record the places you’ve been to and share them with friends. Developed by Foursquare Labs, you will also get recommendations based on the places you and your friends have been to. The app is not just a basic travel companion. It’s a tool for finding promos and sales close by. For the budget traveler, this can be a real lifesaver. Foursquare’s interface is simple enough that new users will have no problems learning. Clear explanations are given as to why they point to a particular recommendation.