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core-js vs Siteimprove

Based on 1582 and 88 real audits

View core-js details | View Siteimprove details
Metriccore-jsSiteimproveWinner
Performance3635core-js
Accessibility8895Siteimprove
Best Practices8486Siteimprove
SEO9194Siteimprove
Security6564core-js
TTFB374ms544mscore-js
Composite7272Tie
Performance
core-js
36
Siteimprove
35
Accessibility
core-js
88
Siteimprove
95
Security
core-js
65
Siteimprove
64
SEO
core-js
91
Siteimprove
94
Composite
core-js
72
Siteimprove
72

core-js and Siteimprove are closely matched, each leading in different categories. core-js has a composite score of 72 while Siteimprove scores 72.

When to choose core-js

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

When to choose Siteimprove

Choose Siteimprove when your primary concern is accessibility and SEO. 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 88 audited Siteimprove 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 Siteimprove?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 35 on average).
Which has better security, core-js or Siteimprove?
core-js sites score higher on security analysis (65 vs 64 on average).
Which has better accessibility, core-js or Siteimprove?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Siteimprove (95 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 Siteimprove?
Siteimprove sites score higher on Lighthouse SEO signals (94 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 Siteimprove?
core-js sites show lower Time to First Byte (374 ms vs 544 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 Siteimprove 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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