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IIS vs Microsoft

Based on 66 and 2502 real audits

View IIS details | View Microsoft details
MetricIISMicrosoftWinner
Performance4540IIS
Accessibility8789Microsoft
Best Practices8486Microsoft
SEO9089IIS
Security6667Microsoft
TTFB513ms330msMicrosoft
Composite7273Microsoft
Performance
IIS
45
Microsoft
40
Accessibility
IIS
87
Microsoft
89
Security
IIS
66
Microsoft
67
SEO
IIS
90
Microsoft
89
Composite
IIS
72
Microsoft
73

Microsoft outperforms IIS in 5 of 7 categories, with a stronger composite score (73 vs 72). IIS leads in performance, SEO.

When to choose IIS

Choose IIS when your primary concern is performance and SEO. Its audit data shows consistent strength in these areas across the sampled sites.

When to choose Microsoft

Choose Microsoft 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 66 audited IIS sites and 2502 audited Microsoft 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, IIS or Microsoft?
Based on real BeaverCheck audits, IIS sites score higher on Lighthouse performance (45 vs 40 on average).
Which has better security, IIS or Microsoft?
Microsoft sites score higher on security analysis (67 vs 66 on average).
Which has better accessibility, IIS or Microsoft?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor Microsoft (89 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, IIS or Microsoft?
IIS sites score higher on Lighthouse SEO signals (90 vs 89 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), IIS or Microsoft?
Microsoft sites show lower Time to First Byte (330 ms vs 513 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 IIS or Microsoft for my website?
Both platforms have trade-offs. IIS scores higher on overall composite score while IIS 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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