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core-js vs Insider

Based on 1599 and 2 real audits

View core-js details | View Insider details
Metriccore-jsInsiderWinner
Performance3634core-js
Accessibility8890Insider
Best Practices8486Insider
SEO9192Insider
Security6562core-js
TTFB379ms472mscore-js
Composite7272Tie
Performance
core-js
36
Insider
34
Accessibility
core-js
88
Insider
90
Security
core-js
65
Insider
62
SEO
core-js
91
Insider
92
Composite
core-js
72
Insider
72

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

When to choose core-js

Choose core-js 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 Insider

Choose Insider when your primary concern is accessibility 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 2 audited Insider 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 →

Small sample: one or both technologies have fewer than 10 audited sites. Treat these numbers as directional — medians stabilize around 20–30 audits per side.

FAQ

Which is faster, core-js or Insider?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 34 on average).
Which has better security, core-js or Insider?
core-js sites score higher on security analysis (65 vs 62 on average).
Which has better accessibility, core-js or Insider?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Insider (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 Insider?
Insider 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 Insider?
core-js sites show lower Time to First Byte (379 ms vs 472 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 Insider 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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