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core-js vs Issuu

Based on 1582 and 13 real audits

View core-js details | View Issuu details
Metriccore-jsIssuuWinner
Performance3641Issuu
Accessibility8888Tie
Best Practices8493Issuu
SEO9191Tie
Security6563core-js
TTFB374ms236msIssuu
Composite7272Tie
Performance
core-js
36
Issuu
41
Accessibility
core-js
88
Issuu
88
Security
core-js
65
Issuu
63
SEO
core-js
91
Issuu
91
Composite
core-js
72
Issuu
72

Issuu outperforms core-js in 3 of 7 categories, with a stronger composite score (72 vs 72). core-js leads in security.

When to choose core-js

Choose core-js when your primary concern is security. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Issuu

Choose Issuu when your primary concern is server response time 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 1582 audited core-js sites and 13 audited Issuu 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 Issuu?
Based on real BeaverCheck audits, Issuu sites score higher on Lighthouse performance (41 vs 36 on average).
Which has better security, core-js or Issuu?
core-js sites score higher on security analysis (65 vs 63 on average).
Which has better accessibility, core-js or Issuu?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 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 Issuu?
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 Issuu?
Issuu sites show lower Time to First Byte (236 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 core-js or Issuu for my website?
Both platforms have trade-offs. Issuu 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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