Polyfill is a service which accepts a request for a set of browser features and returns only the polyfills that are needed by the requesting browser.
Polymer is a web library, built on top of Web Components, and designed to leverage the evolving web platform on modern browsers.
Polyfill.io is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.
In terms of market share, Polymer is clearly lagging behind, losing to Polyfill.io in all segments.
Polyfill.io has better usage coverage in more websites categories. Including Computers Electronics & Technology, Lifestyle, Food & Drink, Science & Education and 20 other categories.
Polymer hasn't got a lead over Polyfill.io in any websites category.
Polyfill.io is leading in most countries, including United States, United Kingdom, Canada, Japan and 160 other countries.
Polymer hasn't got a lead over Polyfill.io in any country.