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core-js vs Piano

Based on 1582 and 99 real audits

View core-js details | View Piano details
Metriccore-jsPianoWinner
Performance3634core-js
Accessibility8885core-js
Best Practices8482core-js
SEO9191Tie
Security6563core-js
TTFB374ms257msPiano
Composite7272Tie
Performance
core-js
36
Piano
34
Accessibility
core-js
88
Piano
85
Security
core-js
65
Piano
63
SEO
core-js
91
Piano
91
Composite
core-js
72
Piano
72

core-js outperforms Piano in 4 of 7 categories, with a stronger composite score (72 vs 72). Piano leads in TTFB.

When to choose core-js

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

When to choose Piano

Choose Piano when your primary concern is server response time. 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 99 audited Piano 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 →

FAQ

Which is faster, core-js or Piano?
Based on real BeaverCheck audits, core-js sites score higher on Lighthouse performance (36 vs 34 on average).
Which has better security, core-js or Piano?
core-js sites score higher on security analysis (65 vs 63 on average).
Which has better accessibility, core-js or Piano?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor core-js (88 vs 85). 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 Piano?
core-js sites score higher on Lighthouse SEO signals (91 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 Piano?
Piano sites show lower Time to First Byte (257 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 Piano 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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