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Bootstrap vs PDF.js

Based on 885 and 3 real audits

View Bootstrap details | View PDF.js details
MetricBootstrapPDF.jsWinner
Performance4620Bootstrap
Accessibility8791PDF.js
Best Practices8778Bootstrap
SEO9092PDF.js
Security6565Tie
TTFB434ms275msPDF.js
Composite7471Bootstrap
Performance
Bootstrap
46
PDF.js
20
Accessibility
Bootstrap
87
PDF.js
91
Security
Bootstrap
65
PDF.js
65
SEO
Bootstrap
90
PDF.js
92
Composite
Bootstrap
74
PDF.js
71

Bootstrap and PDF.js are closely matched, each leading in different categories. Bootstrap has a composite score of 74 while PDF.js scores 71.

When to choose Bootstrap

Choose Bootstrap 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 PDF.js

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

How this comparison was built

Scores are medians across 885 audited Bootstrap sites and 3 audited PDF.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, Bootstrap or PDF.js?
Based on real BeaverCheck audits, Bootstrap sites score higher on Lighthouse performance (46 vs 20 on average).
Which has better security, Bootstrap or PDF.js?
Bootstrap sites score higher on security analysis (65 vs 65 on average).
Which has better accessibility, Bootstrap or PDF.js?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor PDF.js (91 vs 87). 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, Bootstrap or PDF.js?
PDF.js sites score higher on Lighthouse SEO signals (92 vs 90 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), Bootstrap or PDF.js?
PDF.js sites show lower Time to First Byte (275 ms vs 434 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 Bootstrap or PDF.js for my website?
Both platforms have trade-offs. Bootstrap scores higher on overall composite score while Bootstrap 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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