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core-js vs YUI

Based on 1599 and 24 real audits

View core-js details | View YUI details
Metriccore-jsYUIWinner
Performance3640YUI
Accessibility8890YUI
Best Practices8492YUI
SEO9191Tie
Security6568YUI
TTFB379ms354msYUI
Composite7274YUI
Performance
core-js
36
YUI
40
Accessibility
core-js
88
YUI
90
Security
core-js
65
YUI
68
SEO
core-js
91
YUI
91
Composite
core-js
72
YUI
74

YUI outperforms core-js in 6 of 7 categories, with a stronger composite score (74 vs 72). core-js leads in no categories.

When to choose core-js

core-js doesn't clearly lead YUI in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

When to choose YUI

Choose YUI when your primary concern is server response time 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 24 audited YUI 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 YUI?
Based on real BeaverCheck audits, YUI sites score higher on Lighthouse performance (40 vs 36 on average).
Which has better security, core-js or YUI?
YUI sites score higher on security analysis (68 vs 65 on average).
Which has better accessibility, core-js or YUI?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor YUI (90 vs 88). 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 YUI?
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 YUI?
YUI sites show lower Time to First Byte (354 ms vs 379 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 YUI for my website?
Both platforms have trade-offs. YUI 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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