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AOS vs Twenty Twenty-One

Based on 67 and 1 real audits

View AOS details | View Twenty Twenty-One details
MetricAOSTwenty Twenty-OneWinner
Performance4159Twenty Twenty-One
Accessibility9094Twenty Twenty-One
Best Practices8696Twenty Twenty-One
SEO9085AOS
Security6763AOS
TTFB469ms503msAOS
Composite7475Twenty Twenty-One
Performance
AOS
41
Twenty Twenty-One
59
Accessibility
AOS
90
Twenty Twenty-One
94
Security
AOS
67
Twenty Twenty-One
63
SEO
AOS
90
Twenty Twenty-One
85
Composite
AOS
74
Twenty Twenty-One
75

Twenty Twenty-One outperforms AOS in 4 of 7 categories, with a stronger composite score (75 vs 74). AOS leads in SEO, security, TTFB.

When to choose AOS

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

When to choose Twenty Twenty-One

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

How this comparison was built

Scores are medians across 67 audited AOS sites and 1 audited Twenty Twenty-One 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, AOS or Twenty Twenty-One?
Based on real BeaverCheck audits, Twenty Twenty-One sites score higher on Lighthouse performance (59 vs 41 on average).
Which has better security, AOS or Twenty Twenty-One?
AOS sites score higher on security analysis (67 vs 63 on average).
Which has better accessibility, AOS or Twenty Twenty-One?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Twenty Twenty-One (94 vs 90). 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, AOS or Twenty Twenty-One?
AOS sites score higher on Lighthouse SEO signals (90 vs 85 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), AOS or Twenty Twenty-One?
AOS sites show lower Time to First Byte (469 ms vs 503 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 AOS or Twenty Twenty-One for my website?
Both platforms have trade-offs. Twenty Twenty-One scores higher on overall composite score while AOS 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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