Betty Blocks
Betty Blocks stands out as being both easy enough that anyone can use it while boasting capabilities powerful enough to create secure, advanced, enterprise-grade applications. Building apps is done with the visual drag-and-drop interface and pre-programmed building blocks. This way, you are guaranteed to create an app that works flawlessly for unlimited users, in a fast and fun way.
Unlike most no-code platforms, it's no-code with an escape hatch: While it is not necessary to write any code to develop advanced applications, Betty Blocks also supports JavaScript and HTML integrations for added customization. The all-in-one platform is a solution whether your team wants to create desktop apps, mobile apps, native apps, web applications, online database applications, or other custom apps.
AppSheet
AppSheet is a no-code platform. However, AppSheet is focused on spreadsheets (e.g. google sheets) as a database for building your applications, while Betty Blocks can be based on any data model of your liking.
AppSheet mainly focuses on a single app, or simpler mobile applications for small businesses, which are done in minutes by using premade templates.