core-js vs decimal.js

core-js is the more common of the two in our index: it runs on 15,855 websites against 14 for decimal.js, and 6 sites use both. Counts come from real scans, not vendor claims.

core-js: 15,855
decimal.js: 14

core-js

core-js is a modular standard library for JavaScript, with polyfills for cutting-edge ECMAScript features.

Indexed sites: 15,855
Share of JavaScript libraries: 45%

Well-known sites using it

microsoft.com3.6.4
mail.ru3.26.1
dzen.ru2.6.12
azure.com3.25.0
cloud.microsoft3.33.0
gandi.net3.45.1

All 15,855 sites

decimal.js

Indexed sites: 14
Share of JavaScript libraries: 0%

Well-known sites using it

All 14 sites

Used together

6 sites run both core-js and decimal.js. That is 43% of the sites using decimal.js, the smaller of the two.

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Want to know which one a particular site uses? Look it up and see its whole stack, or compare two sites side by side.