core-js vs Turbopack

core-js is on 3,526 of the scanned sites, Turbopack on 2,127, and 247 run both. Counted from the latest scan of each site.

Modular JavaScript polyfill library for ECMAScript features and proposals, whose maintainer said in 2023 he worked alone.

3,526 sites36% of the 9,860 scanned sites using Frontend Build Tools & CSS+5 sites in the last 90 days, open-source

Incremental Rust bundler built into Next.js, where it is the default.

2,127 sites22% of the 9,860 scanned sites using Frontend Build Tools & CSS+4 sites in the last 90 days, open-source

Switches between them

A switch is a confirmed removal of one and an addition of the other on the same site, between two of our monthly scans.

core-js → Turbopack0

Turbopack → core-js0

Sites running both247

No switches between the two yet. We rescan every site monthly and count each one here.

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