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core-js vs Grin

Based on 1582 and 3 real audits

View core-js details | View Grin details
Metriccore-jsGrinWinner
Performance3623core-js
Accessibility8886core-js
Best Practices8479core-js
SEO9194Grin
Security6568Grin
TTFB374ms218msGrin
Composite7272Tie
Performance
core-js
36
Grin
23
Accessibility
core-js
88
Grin
86
Security
core-js
65
Grin
68
SEO
core-js
91
Grin
94
Composite
core-js
72
Grin
72

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

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 Grin

Choose Grin when your primary concern is server response time 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 3 audited Grin 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 Grin?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 23 on average).
Which has better security, core-js or Grin?
Grin sites score higher on security analysis (68 vs 65 on average).
Which has better accessibility, core-js or Grin?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 86). 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 Grin?
Grin sites score higher on Lighthouse SEO signals (94 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 Grin?
Grin sites show lower Time to First Byte (218 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 Grin 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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