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core-js vs Microsoft Clarity

Based on 1600 and 343 real audits

View core-js details | View Microsoft Clarity details
Metriccore-jsMicrosoft ClarityWinner
Performance3533core-js
Accessibility8790Microsoft Clarity
Best Practices8383Tie
SEO9192Microsoft Clarity
Security6565Tie
TTFB378ms403mscore-js
Composite7272Tie
Performance
core-js
35
Microsoft Clarity
33
Accessibility
core-js
87
Microsoft Clarity
90
Security
core-js
65
Microsoft Clarity
65
SEO
core-js
91
Microsoft Clarity
92
Composite
core-js
72
Microsoft Clarity
72

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

Choose Microsoft Clarity 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 1600 audited core-js sites and 343 audited Microsoft Clarity 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 Microsoft Clarity?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (35 vs 33 on average).
Which has better security, core-js or Microsoft Clarity?
core-js sites score higher on security analysis (65 vs 65 on average).
Which has better accessibility, core-js or Microsoft Clarity?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Microsoft Clarity (90 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 Microsoft Clarity?
Microsoft Clarity sites score higher on Lighthouse SEO signals (92 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 Microsoft Clarity?
core-js sites show lower Time to First Byte (378 ms vs 403 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 Microsoft Clarity 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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