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core-js vs Format

Based on 2041 and 11 real audits

View core-js details | View Format details
Metriccore-jsFormatWinner
Performance3763Format
Accessibility8897Format
Best Practices8679core-js
SEO91100Format
Security6873Format
TTFB483ms645mscore-js
Composite7480Format
Performance
core-js
37
Format
63
Accessibility
core-js
88
Format
97
Security
core-js
68
Format
73
SEO
core-js
91
Format
100
Composite
core-js
74
Format
80

Format outperforms core-js in 5 of 7 categories, with a stronger composite score (80 vs 74). core-js leads in best practices, TTFB.

When to choose core-js

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

When to choose Format

Choose Format when your primary concern is performance and accessibility. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 2041 audited core-js sites and 11 audited Format 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 Format?
Based on real BeaverCheck audits, Format sites score higher on Lighthouse performance (63 vs 37 on average).
Which has better security, core-js or Format?
Format sites score higher on security analysis (73 vs 68 on average).
Which has better accessibility, core-js or Format?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Format (97 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 Format?
Format sites score higher on Lighthouse SEO signals (100 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 Format?
core-js sites show lower Time to First Byte (483 ms vs 645 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 Format for my website?
Both platforms have trade-offs. Format 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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