Sandbox coloring, one of the most popular pixel art coloring book apps are the latest craze among the children. The coloring book apps have remained one favorite of all the time but the current craze is all because of a new twist in coloring app. The app offers a number of picks to the users along with featuring retro-look, pixel-art designs. Unlike the current trend (famous &ldquo;coloring app for children&rdquo;), previous coloring book app was famous as &ldquo;coloring books for adults&rdquo;.Such coloring books have become the latest trends among a series of apps including sandbox coloring, pixel art, UNICORN, &amp; Color by Number as well. While the latest trend has been started by sandbox coloring, the app Unicorn is the one that is leading the charts for this month. These top apps have a combined downloads of 12 million that is quite impressive.It is worth to note that these apps generate a massive revenue through subscription. Additionally, it is not one-time purchase that other kids apps did in the past. The above-mentioned apps have options including weekly, monthly, and annual subscription to offer a number of choices to the users. In addition to this, the features are worth mentioning including the regular release of new images, ad removal options, and the ability to unlock unlimited pictures to mention a few.While App Store trends appear and go gradually, such apps absolutely contribute exceptionally well to add to the entire revenue. The audience base of such apps makes them one exceptional for generating the revenues. As children love to browse through such applications, it is obvious for these apps to generate huge revenue for the app and the App Store as well. In present, the rank of these apps has dropped for a while but they carry all the potential to top the charts once again owing to their huge audience base.