Create React Native App vs J2ObjC: What are the differences?

Developers describe Create React Native App as "Create a React Native app on any OS with no build config". Create React Native App allows you to work with all of the Components and APIs in React Native, as well as most of the JavaScript APIs that the Expo App provides. On the other hand, J2ObjC is detailed as "Java to iOS Objective-C translation tool and runtime used by Google Inbox to share 70% of its code across Android, iOS, and Web". J2ObjC is an open-source command-line tool from Google that translates Java code to Objective-C for the iOS (iPhone/iPad) platform. This tool enables Java code to be part of an iOS application's build, as no editing of the generated files is necessary. The goal is to write an app's non-UI code (such as data access, or application logic) in Java, which is then shared by web apps (using GWT), Android apps, and iOS apps.

Create React Native App and J2ObjC can be categorized as "Cross-Platform Mobile Development" tools.

Create React Native App and J2ObjC are both open source tools. It seems that Create React Native App with 11.6K GitHub stars and 1.3K forks on GitHub has more adoption than J2ObjC with 5.47K GitHub stars and 771 GitHub forks.