The best core-js alternatives

3 tools that do a similar job to core-js, 3 of them open source. Each entry says what it does and who it suits, so you can pick the one that fits instead of the most famous.

You're replacing

core-js

A JavaScript library that adds missing modern language features to older browsers and engines.

1. 1

   x-spreadsheet

   Open source · MIT · ★ 14.6k

   A web-based JavaScript spreadsheet you can embed in a page, Excel-style, with no server needed.

   Best for: Web developers who want a spreadsheet-style editor inside their own app; Teams building internal tools that need cell editing, formulas, or data entry in the browser

   Full review core-js vs x-spreadsheet
2. 2

   window.fetch polyfill

   Open source · MIT · ★ 25.8k

   A browser polyfill that adds window.fetch to older browsers that lack it.

   Best for: Front-end developers maintaining web apps that must support older browsers; Teams replacing XMLHttpRequest code with a Promise-based API

   Full review
3. 3

   React-Grid-Layout

   Open source · MIT · ★ 22.5k

   A React component library for draggable, resizable grid layouts with responsive breakpoints.

   Best for: React developers building dashboards with movable panels; Teams migrating from v1 who can use the legacy wrapper for a smoother transition

   Full review

How we pick: tools in the same category that solve the same problem, projects that name each other as alternatives, and open-source projects that describe themselves as an alternative to core-js. We don't take payment for placement.