Google Now, available for iOS as part of Google Search, along with all the digital assistants highlighted in this story, is designed to assemble and offer up the most relevant information. Google Now, however, tries to top all the others. The free app strives to determine exactly what information you need and present it to you without you having to ask. Using your location, it pops up traffic and weather conditions, along with updates on your favorite sports teams and news items, throughout your day. Tap on the screen and you can use Google's Voice Search to hunt for information conversationally. You can also ask it to track down local restaurants, movie times and other goings-on. Google Search works on the iPhone, iPod touch and iPad with iOS 5.0 or later.