core-js vs Slimbox 2

core-js is the more common of the two in our index: it runs on 19,972 websites against 5 for Slimbox 2, and 1 sites use both. Counts come from real scans, not vendor claims.

core-js: 19,972
Slimbox 2: 5

core-js

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

Indexed sites: 19,972
Share of JavaScript libraries: 44%

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 19,972 sites

Slimbox 2

Indexed sites: 5
Share of JavaScript libraries: 0%

Well-known sites using it

All 5 sites

Used together

1 site runs both core-js and Slimbox 2. That is 20% of the sites using Slimbox 2, 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.