🆚 css-vars-ponyfill vs. Prefix-free
- 📈 css-vars-ponyfill is three times more popular than Prefix-free.
- 🌎 css-vars-ponyfill is more popular in the United States, the United Kingdom, and Japan.
- 🌍 Prefix-free is more popular in China, Korea, and Iran.
Statistics based on 3.8M+ analyzed websites. About this data
Prefix-freeType
JavaScript library
JavaScript library
About
Client-side support for 
CSS custom properties (aka "CSS variables") in legacy and modern browsers.
A legacy script that adds browser prefixes to CSS code when needed for old browsers.
Pricing
Free ✔️ Open source
Free ✔️ Open source
Categories
Popularity
Determined by the number of sites using each technology.
The css-vars-ponyfill JavaScript library is 2.8 times more popular than Prefix-free.
Total websites
Market share
JavaScript Libraries
Popularity by country
Determined by the number of sites detected from each country.
css-vars-ponyfill is more popular in the United States, the United Kingdom, and Japan, while Prefix-free is more popular in China, Korea, and Iran.
United States
United Kingdom
Japan
Germany
Canada
Australia
India
France
Italy
Austria
Awards
- ⬆️ 68th most popular in Austria in the JavaScript Libraries category.
- ⬆️ 72nd most popular in Finland in the JavaScript Libraries category.
- ⬆️ 93rd most popular in Denmark in the JavaScript Libraries category.
- ⬆️ 94th most popular in Canada in the JavaScript Libraries category.
- ⬆️ 94th most popular in New Zealand in the JavaScript Libraries category.
- 🔥 15th most popular in Iran in the Legacy category.
- 🔥 17th most popular in Korea in the Legacy category.
- 🔥 17th most popular in China in the Legacy category.
- ⬆️ 29th most popular in Russia in the Legacy category.
- ⬆️ 34th most popular in Japan in the Legacy category.
Popularity by domain category
Determined by the number of sites in each category.
css-vars-ponyfill is more popular among sites focused on online shopping, business, and marketing and merchandising, while Prefix-free is more commonly used on government and military sites.
Online Shopping
Business
Marketing/Merchandising
General News
Fashion/Beauty
Travel
Education/Reference
Internet Services
Entertainment
Blogs/Wiki
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 3,814,833 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.