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33Across vs core-js

Based on 14 and 1582 real audits

View 33Across details | View core-js details
Metric33Acrosscore-jsWinner
Performance2936core-js
Accessibility8688core-js
Best Practices7784core-js
SEO9091core-js
Security666533Across
TTFB311ms374ms33Across
Composite7272Tie
Performance
33Across
29
core-js
36
Accessibility
33Across
86
core-js
88
Security
33Across
66
core-js
65
SEO
33Across
90
core-js
91
Composite
33Across
72
core-js
72

core-js outperforms 33Across in 4 of 7 categories, with a stronger composite score (72 vs 72). 33Across leads in security, TTFB.

When to choose 33Across

Choose 33Across when your primary concern is server response time and security. Its audit data shows consistent strength in these areas across the sampled sites.

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.

How this comparison was built

Scores are medians across 14 audited 33Across sites and 1582 audited core-js 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, 33Across or core-js?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 29 on average).
Which has better security, 33Across or core-js?
33Across sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, 33Across or core-js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 86). 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, 33Across or core-js?
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), 33Across or core-js?
33Across sites show lower Time to First Byte (311 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 33Across or core-js for my website?
Both platforms have trade-offs. core-js scores higher on overall composite score while 33Across 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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