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core-js vs UmiJs

Based on 1488 and 1 real audits

View core-js details | View UmiJs details
Metriccore-jsUmiJsWinner
Performance3659UmiJs
Accessibility8839core-js
Best Practices8381core-js
SEO9192UmiJs
Security6463core-js
TTFB359ms1287mscore-js
Composite7273UmiJs
Performance
core-js
36
UmiJs
59
Accessibility
core-js
88
UmiJs
39
Security
core-js
64
UmiJs
63
SEO
core-js
91
UmiJs
92
Composite
core-js
72
UmiJs
73

core-js outperforms UmiJs in 4 of 7 categories, with a stronger composite score (72 vs 73). UmiJs leads in performance, SEO, composite score.

When to choose core-js

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

When to choose UmiJs

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

How this comparison was built

Scores are medians across 1488 audited core-js sites and 1 audited UmiJs 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 UmiJs?
Based on real BeaverCheck audits, UmiJs sites score higher on Lighthouse performance (59 vs 36 on average).
Which has better security, core-js or UmiJs?
core-js sites score higher on security analysis (64 vs 63 on average).
Which has better accessibility, core-js or UmiJs?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 39). 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 UmiJs?
UmiJs 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 UmiJs?
core-js sites show lower Time to First Byte (359 ms vs 1287 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 UmiJs for my website?
Both platforms have trade-offs. UmiJs 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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