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core-js vs SWC

Based on 1582 and 27 real audits

View core-js details | View SWC details
Metriccore-jsSWCWinner
Performance3630core-js
Accessibility8887core-js
Best Practices8480core-js
SEO9191Tie
Security6564core-js
TTFB374ms349msSWC
Composite7272Tie
Performance
core-js
36
SWC
30
Accessibility
core-js
88
SWC
87
Security
core-js
65
SWC
64
SEO
core-js
91
SWC
91
Composite
core-js
72
SWC
72

core-js outperforms SWC in 4 of 7 categories, with a stronger composite score (72 vs 72). SWC leads in TTFB.

When to choose core-js

Choose core-js when your primary concern is performance and best practices. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose SWC

Choose SWC when your primary concern is server response time. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 1582 audited core-js sites and 27 audited SWC sites in the BeaverCheck database. Every audit runs the same 100+ checks — Lighthouse performance, security headers, accessibility, SEO, server response time — against a real URL. No vendor input, no sponsorship, no affiliate links. Read the full methodology →

FAQ

Which is faster, core-js or SWC?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 30 on average).
Which has better security, core-js or SWC?
core-js sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, core-js or SWC?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 87). Both technologies can be made fully accessible with care — the difference reflects common patterns in the sampled sites, not inherent platform limits.
Which is better for SEO, core-js or SWC?
core-js sites score higher on Lighthouse SEO signals (91 vs 91 on average), which cover meta tags, crawlability, mobile friendliness, and structured data. Content strategy and backlinks still matter more than platform choice for ranking.
Which has faster server response (TTFB), core-js or SWC?
SWC sites show lower Time to First Byte (349 ms vs 374 ms on average). TTFB depends heavily on hosting and CDN setup rather than the technology itself, but the sampled sites suggest a meaningful difference in common deployment patterns.
Should I choose core-js or SWC for my website?
Both platforms have trade-offs. core-js scores higher on overall composite score while core-js may excel in metrics you care about most. Run a free BeaverCheck audit on a real site using each to compare the metrics relevant to your use case.
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