Smartphones and tablets are revolutionizing the magazine industry with eye-popping content and easy navigation. Here are Mobilewalla's highest-rated tablet apps from the digital newsstand.ApplePopular Mechanics (Free)* Stay up-to-date with the latest technology in everything from cars to electronic gadgetry. After the free trial, each month is $1.99. (Mobilewalla score: 99/100)Seventeen (Free)* The leading magazine for teens doesn't disappoint, with each edition covering the latest in fashion and pop culture. (Score: 99/100)Better Homes and Gardens (Free)* From design and decorating ideas to full house plans, there is something for every homeowner in this app. (Score: 99/100)National Geographic (Free)* The magazine known for its mind-blowing photography is best enjoyed in high definition on a tablet. Well worth the $1.99 monthly subscription. (Score: 99/100)Rolling Stone (Free)* Get a free month of the latest in music and movie pop culture in this well-designed and newly updated app. (Score: 98/100)AndroidFlipboard (Free)* Get your news and social-media streams from Facebook and Twitter all in one place. (Mobilewalla score: 99/100)NY Times for Android (Free) Get a free trial subscription to the paper of record. The latest update includes improved navigation for Android devices. (Score: 97/100)CNN (Free)* Stay current on the day's events in real time with trusted reporting from around the globe. Be part of the news by uploading your own tips and images. (Score: 94/100)Pocket Casts ($2.99)* Recently updated with better navigation and search functions, this is the ultimate podcast player. (Score: 90/100)Instapaper ($2.99)* Quickly tab and save articles that you want to read later. Optimizes the size for quick downloads and offline reading. (Score: 86/100)Apps with an asterisk (*) denote availability on Apple and Android.Mobilewalla is a search-and-discovery engine using breakthrough technology to score every app to help consumers navigate the mobile application marketplace. Apps are scored using an algorithm that weighs several characteristics, including user ratings, position within category and staff recommendations. For more app intel, go to www.mobilewalla.com. Anindya Datta is a technologist and founder of Mobilewalla.