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core-js vs Klaviyo

Based on 1570 and 48 real audits

View core-js details | View Klaviyo details
Metriccore-jsKlaviyoWinner
Performance3628core-js
Accessibility8887core-js
Best Practices8480core-js
SEO9191Tie
Security6570Klaviyo
TTFB371ms223msKlaviyo
Composite7273Klaviyo
Performance
core-js
36
Klaviyo
28
Accessibility
core-js
88
Klaviyo
87
Security
core-js
65
Klaviyo
70
SEO
core-js
91
Klaviyo
91
Composite
core-js
72
Klaviyo
73

core-js and Klaviyo are closely matched, each leading in different categories. core-js has a composite score of 72 while Klaviyo scores 73.

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.

When to choose Klaviyo

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

How this comparison was built

Scores are medians across 1570 audited core-js sites and 48 audited Klaviyo 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 Klaviyo?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 28 on average).
Which has better security, core-js or Klaviyo?
Klaviyo sites score higher on security analysis (70 vs 65 on average).
Which has better accessibility, core-js or Klaviyo?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 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 Klaviyo?
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 Klaviyo?
Klaviyo sites show lower Time to First Byte (223 ms vs 371 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 Klaviyo 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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