Upgrade the web. Automatically.

What is Polyfill.io?

It's a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.

Why do I need it?

There are lots of differing browsers and browser versions in use throughout the world, each one has a slighly different set of features to the rest. This can make developing for browsers a difficult task. The latest versions of the popular browsers can do lots of things which older browsers can not – but you may still have to support the older browsers. Polyfill.io makes it simpler to support differing browsers by attempting to recreate the missing features with polyfills: You can make use of the latest and greatest features in browsers which support them, and in those that do not.