Ext JS vs React: What are the differences?
Ext JS: Create data-intensive HTML5 applications using JavaScript. Helps build data-intensive, cross-platform web apps for desktops, tablets, and smartphones. Enables organizations to handle millions of records and provides out-of-the-box functionality such as sorting, grouping, column locking, and sum; React: A JavaScript library for building user interfaces. Lots of people use React as the V in MVC. Since React makes no assumptions about the rest of your technology stack, it's easy to try it out on a small feature in an existing project.
Ext JS and React are primarily classified as "Javascript Utilities & Libraries" and "Javascript UI Libraries" tools respectively.
React is an open source tool with 132K GitHub stars and 24.5K GitHub forks. Here's a link to React's open source repository on GitHub.
According to the StackShare community, React has a broader approval, being mentioned in 3224 company stacks & 3094 developers stacks; compared to Ext JS, which is listed in 12 company stacks and 7 developer stacks.