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core-js vs Format

Based on 1582 and 5 real audits

View core-js details | View Format details
Metriccore-jsFormatWinner
Performance3627core-js
Accessibility88100Format
Best Practices8473core-js
SEO91100Format
Security6560core-js
TTFB374ms1223mscore-js
Composite7270core-js
Performance
core-js
36
Format
27
Accessibility
core-js
88
Format
100
Security
core-js
65
Format
60
SEO
core-js
91
Format
100
Composite
core-js
72
Format
70

core-js outperforms Format in 5 of 7 categories, with a stronger composite score (72 vs 70). Format leads in accessibility, SEO.

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 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 1582 audited core-js sites and 5 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 →

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 Format?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 27 on average).
Which has better security, core-js or Format?
core-js sites score higher on security analysis (65 vs 60 on average).
Which has better accessibility, core-js or Format?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Format (100 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 (374 ms vs 1223 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. 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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