SG Builder is described as 'Create Android Apps without Coding. Code with Blocks and Make Your Dream App with No Programming Knowledge' and is an app. There are four alternatives to SG Builder for Online / Web-based and Android. The best alternative is MIT App Inventor, which is both free and Open Source. Other great apps like SG Builder are Thunkable, Kodular and Casagbic.
Much more than a modern app creator without coding
It allows people to create apps without coding using a simple drag-and-drop app creator. It also provides a free Play Store alternative, and an Extensions IDE for advanced users.