Niotron Builder is described as 'Niotron is a No Code App Builder Platform that lets you build Android Apps without any prior coding experience. Use Blocks and bring your ideas into working functional app within minutes'. There are six alternatives to Niotron Builder for Online / Web-based, Android, Android Tablet and Windows. The best alternative is Thunkable, which is free. Other great apps like Niotron Builder are MIT App Inventor (Free, Open Source), Kodular (Free), AppyBuilder (Freemium) and Casagbic (Free).
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.