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American Express vs core-js

Based on 6 and 1570 real audits

View American Express details | View core-js details
MetricAmerican Expresscore-jsWinner
Performance4136American Express
Accessibility8388core-js
Best Practices9184American Express
SEO9391American Express
Security7665American Express
TTFB273ms371msAmerican Express
Composite7572American Express
Performance
American Express
41
core-js
36
Accessibility
American Express
83
core-js
88
Security
American Express
76
core-js
65
SEO
American Express
93
core-js
91
Composite
American Express
75
core-js
72

American Express outperforms core-js in 6 of 7 categories, with a stronger composite score (75 vs 72). core-js leads in accessibility.

When to choose American Express

Choose American Express when your primary concern is server response time and security. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose core-js

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

How this comparison was built

Scores are medians across 6 audited American Express sites and 1570 audited core-js 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, American Express or core-js?
Based on real BeaverCheck audits, American Express sites score higher on Lighthouse performance (41 vs 36 on average).
Which has better security, American Express or core-js?
American Express sites score higher on security analysis (76 vs 65 on average).
Which has better accessibility, American Express or core-js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 83). 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, American Express or core-js?
American Express sites score higher on Lighthouse SEO signals (93 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), American Express or core-js?
American Express sites show lower Time to First Byte (273 ms vs 371 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 American Express or core-js for my website?
Both platforms have trade-offs. American Express scores higher on overall composite score while American Express 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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