Ignite UI vs React.js Boilerplate: What are the differences?

Ignite UI: JavaScript UI for Modern Web App Development- full support for AngularJS, KnockoutJS, Microsoft MVC, Boostrap, Ionic, Onsen and more. HTML & JavaScript toolkit to build modern browser experiences on any device – desktop, tablet or phone. Designed for the enterprise - high-performance, touch-first, responsive apps – with AngularJS directives, Bootstrap support and ASP.NET MVC server-side wrappers; React.js Boilerplate: 🔥 Quick setup for performance orientated, offline-first React.js apps. Quick setup for new performance orientated, offline–first React.js applications featuring Redux, hot–reloading, PostCSS, react-router, ServiceWorker, AppCache, FontFaceObserver and Mocha.

Ignite UI and React.js Boilerplate can be primarily classified as "Javascript UI Libraries" tools.

Some of the features offered by Ignite UI are:

• Data Grid
• Hierarchical Data Grid
• Tree Grid

On the other hand, React.js Boilerplate provides the following key features:

• Using react-transform-hmr, your changes in the CSS and JS get reflected in the app instantly without refreshing the page. That means that the current application state persists even when you change something in the underlying code! For a very good explanation and demo, watch Dan Abramov himself talking about it at react-europe.
• Redux is a much better implementation of a flux–like, unidirectional data flow. Redux makes actions composable, reduces the boilerplate code and makes hot–reloading possible in the first place. For a good overview of redux, check out the talk linked above or the official documentation!
• Babel is a modular JavaScript transpiler that helps to use next generation JavaScript and more, like transformation for JSX, hot loading, error catching etc. Babel has a solid ecosystem of offical preset and plugins.

React.js Boilerplate is an open source tool with 22.9K GitHub stars and 4.59K GitHub forks. Here's a link to React.js Boilerplate's open source repository on GitHub.