BENGALURU: India is rapidly moving into the mobile app age and is already the fourth-largest mobile app economy. The amount of time Indians spend on apps has also increased dramatically, says mobile-app analytics company App Annie. In total app downloads per year, only China, US, and Brazil are ahead of India. The annual figure for India is projected to grow by 92% to reach 7.7 billion downloads this year, and further to 20.1 billion by 2020. China's app download is expected to grow at a much slower 29% this year, but the absolute figure will be more than 6 times that of India's at 49 billion. With the introduction of affordable smartphones and better infrastructure supporting mobile, and given India's population, the growth here is expected to be significant," Junde Yu, MD of App Annie APAC, said. He said the most important thing that is now driving the app economy here is not the number of downloads .