What are some alternatives?
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
OpenXava - OpenXava is a Web Java Framework for Rapid Development of Enterprise Applications.
Bubble - Don't hire engineers! Bubble let's you build an app entirely visually
Retool - Build custom internal tools in minutes.
AppSheet - AppSheet enables users to create mobile apps instantly for both OS and Android.
OutSystems - Build Enterprise-Grade Apps Fast.