Android Builder is described as 'has a good servers and easy to use without any lag'. There are six alternatives to Android Builder for Online / Web-based, Android, Android Tablet, SaaS and Windows. The best alternative is Thunkable, which is free. Other great apps like Android Builder are MIT App Inventor (Free, Open Source), Kodular (Free), Niotron Builder (Freemium) and AppyBuilder (Freemium).
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.