It's free for two pictures
Unless you willing to pay for more than two pictures that are almost impossible for a child to actually do the picture; it's a waste to download.
Not enough ratings yet to assess Kids Tap to Color.
Kids Tap to Color - Zoo Coloring Book For Kids appears to be a legitimate app. AppsHunter Legitimacy Score for Kids Tap to Color is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.