🆚 Modernizr vs. Polyfill
- 📈 Polyfill is noticeably more popular than Modernizr.
- 🌎 Polyfill is more popular in the United States, the United Kingdom, and Germany.
- 🌍 Modernizr is more popular in Turkey, Korea, and Bulgaria.
Modernizr
PolyfillType
About
Modernizr is an open-source feature detection library that identifies browser support for 
HTML, 
CSS, and 
JavaScript features and allows websites to adapt accordingly.
It enables developers to detect supported browser features at runtime, apply progressive enhancement, load polyfills only when required, and provide fallbacks for unsupported features.
Polyfill.io is an open-source JavaScript library that provides modern web API features to older browsers that do not natively support them.
It was originally owned by the Financial Times web team, then moved under community management, and after a supply chain attack in 2024 involving its cdn.polyfill.io domain, the service was discontinued and is now safely mirrored and maintained by 
Cloudflare and 
Fastly.
Headquarters
Website
Pricing
Categories
Popularity
Determined by the number of sites using each technology.
Market share
Popularity by country
Determined by the number of sites detected from each country.
Awards
- ⭐ 5th most popular in Lebanon in the JavaScript Libraries category.
- ⭐ 6th most popular in Germany in the JavaScript Libraries category.
- ⭐ 6th most popular in Belgium in the JavaScript Libraries category.
- ⭐ 7th most popular in Switzerland in the JavaScript Libraries category.
- ⭐ 7th most popular in Portugal in the JavaScript Libraries category.
- 🥈 Second most popular in Russia in the JavaScript Libraries category.
- 🥈 Second most popular in Belarus in the JavaScript Libraries category.
- 🥉 Third most popular in the Netherlands in the JavaScript Libraries category.
- 🥉 Third most popular in Switzerland in the JavaScript Libraries category.
- 🥉 Third most popular in Belgium in the JavaScript Libraries category.
Popularity by domain category
Determined by the number of sites in each category.
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
🗃️ About This Data
- We evaluate the popularity of technologies based on the number of websites where we detect their usage.
- Technologies without a detectable web footprint, and those we do not track, are not reflected in the calculated market share.
- This report is based on the analysis of 3,629,123 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.