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Chart.js vs Flat UI

Based on 28 and 1 real audits

View Chart.js details | View Flat UI details
MetricChart.jsFlat UIWinner
Performance4044Flat UI
Accessibility8787Tie
Best Practices8996Flat UI
SEO9192Flat UI
Security6664Chart.js
TTFB463ms560msChart.js
Composite7372Chart.js
Performance
Chart.js
40
Flat UI
44
Accessibility
Chart.js
87
Flat UI
87
Security
Chart.js
66
Flat UI
64
SEO
Chart.js
91
Flat UI
92
Composite
Chart.js
73
Flat UI
72

Chart.js and Flat UI are closely matched, each leading in different categories. Chart.js has a composite score of 73 while Flat UI scores 72.

When to choose Chart.js

Choose Chart.js 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 Flat UI

Choose Flat UI when your primary concern is best practices and performance. Its audit data shows consistent strength in these areas across the sampled sites.

How this comparison was built

Scores are medians across 28 audited Chart.js sites and 1 audited Flat UI 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, Chart.js or Flat UI?
Based on real BeaverCheck audits, Flat UI sites score higher on Lighthouse performance (44 vs 40 on average).
Which has better security, Chart.js or Flat UI?
Chart.js sites score higher on security analysis (66 vs 64 on average).
Which has better accessibility, Chart.js or Flat UI?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Chart.js (87 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, Chart.js or Flat UI?
Flat UI 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), Chart.js or Flat UI?
Chart.js sites show lower Time to First Byte (463 ms vs 560 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 Chart.js or Flat UI for my website?
Both platforms have trade-offs. Flat UI scores higher on overall composite score while Chart.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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