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.
LightBox is leading in Top 1M Sites and The Entire Web.
Polyfill.io is leading in Top 10K Sites and Top 100K Sites.
LightBox has better usage coverage in more websites categories. Including Science & Education, Arts & Entertainment, Computers Electronics & Technology, Games and 20 other categories.
Polyfill.io hasn't got a lead over LightBox in any websites category.
LightBox is leading in most countries, including Germany, Japan, Russia, South Korea and 139 other countries.
Polyfill.io is leading in United States, United Kingdom, Canada, Brazil and 19 other countries.