🆚 css-vars-ponyfill vs. Prefix-free
- 📈 css-vars-ponyfill is twice as popular as Prefix-free.
- 🌎 css-vars-ponyfill is more popular in the United States, the United Kingdom, and Germany.
- 🌍 Prefix-free is more popular in China, Korea, and Iran.
Statistics based on 3.3M+ 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 2.4 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 Germany, while Prefix-free is more popular in China, Korea, and Iran.
United States
United Kingdom
Germany
Japan
Canada
India
Australia
France
Netherlands
Italy
Awards
- ⬆️ 77th most popular in Austria in the JavaScript Libraries category.
- ⬆️ 87th most popular in Finland in the JavaScript Libraries category.
- ⬆️ 88th most popular in New Zealand in the JavaScript Libraries category.
- ⬆️ 102nd most popular in Canada in the JavaScript Libraries category.
- ⬆️ 104th most popular in Denmark in the JavaScript Libraries category.
- 🔥 14th most popular in Iran in the Legacy category.
- 🔥 16th most popular in China in the Legacy category.
- 🔥 16th most popular in Korea in the Legacy category.
- ⬆️ 25th most popular in Hong Kong in the Legacy category.
- ⬆️ 26th most popular in Switzerland 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 software and hardware, and government and military sites.
Online Shopping
Business
Marketing/Merchandising
General News
Travel
Education/Reference
Fashion/Beauty
Internet Services
Entertainment
Blogs/Wiki
Top sites
Top-ranked sites that use these technologies.
Compare alternatives
Technologies with similar characteristics.
Emotion
Animsition
Beasties🗃️ 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 3,375,483 websites.
- Statistics were last calculated on .
- For more details, see our methodology and disclaimer.