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American Express vs Mastercard

Based on 6 and 6 real audits

View American Express details | View Mastercard details
MetricAmerican ExpressMastercardWinner
Performance4141Tie
Accessibility8383Tie
Best Practices9191Tie
SEO9393Tie
Security7676Tie
TTFB273ms273msTie
Composite7575Tie
Performance
American Express
41
Mastercard
41
Accessibility
American Express
83
Mastercard
83
Security
American Express
76
Mastercard
76
SEO
American Express
93
Mastercard
93
Composite
American Express
75
Mastercard
75

American Express and Mastercard are closely matched, each leading in different categories. American Express has a composite score of 75 while Mastercard scores 75.

When to choose American Express

American Express doesn't clearly lead Mastercard in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

When to choose Mastercard

Mastercard doesn't clearly lead American Express in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

How this comparison was built

Scores are medians across 6 audited American Express sites and 6 audited Mastercard 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 Mastercard?
Based on real BeaverCheck audits, American Express sites score higher on Lighthouse performance (41 vs 41 on average).
Which has better security, American Express or Mastercard?
American Express sites score higher on security analysis (76 vs 76 on average).
Which has better accessibility, American Express or Mastercard?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor American Express (83 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 Mastercard?
American Express sites score higher on Lighthouse SEO signals (93 vs 93 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 Mastercard?
American Express sites show lower Time to First Byte (273 ms vs 273 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 Mastercard 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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