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core-js vs Modernizr

Based on 1599 and 263 real audits

View core-js details | View Modernizr details
Metriccore-jsModernizrWinner
Performance3644Modernizr
Accessibility8885core-js
Best Practices8486Modernizr
SEO9190core-js
Security6564core-js
TTFB379ms400mscore-js
Composite7273Modernizr
Performance
core-js
36
Modernizr
44
Accessibility
core-js
88
Modernizr
85
Security
core-js
65
Modernizr
64
SEO
core-js
91
Modernizr
90
Composite
core-js
72
Modernizr
73

core-js outperforms Modernizr in 4 of 7 categories, with a stronger composite score (72 vs 73). Modernizr leads in performance, best practices, composite score.

When to choose core-js

Choose core-js when your primary concern is server response time and accessibility. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Modernizr

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

How this comparison was built

Scores are medians across 1599 audited core-js sites and 263 audited Modernizr 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 Modernizr?
Based on real BeaverCheck audits, Modernizr sites score higher on Lighthouse performance (44 vs 36 on average).
Which has better security, core-js or Modernizr?
core-js sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, core-js or Modernizr?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 85). 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 Modernizr?
core-js sites score higher on Lighthouse SEO signals (91 vs 90 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 Modernizr?
core-js sites show lower Time to First Byte (379 ms vs 400 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 Modernizr for my website?
Both platforms have trade-offs. Modernizr 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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