Although Tynker is relatively new, we definitely count it as one of the better coding apps. 
The interface looks similar to Scratch. But while Scratch was designed to program, Tynker was built to teach programming. 
The app features starter lesson plans, classroom management tools, and an online showcase of student-created programs. Lessons are self-paced and simple for students to follow without assistance. 
It's a complete learning system with online courses that teach programming and computational thinking to kids of all ages, whether or not they have prior experience. Courses are designed to motivate and inspire kids to bring their creative ideas to life.


Platform: Web (www.tynker.com)

Cost: Free!