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IIS vs Microsoft IIS

Based on 61 and 61 real audits

View IIS details | View Microsoft IIS details
MetricIISMicrosoft IISWinner
Performance4444Tie
Accessibility8888Tie
Best Practices8484Tie
SEO9090Tie
Security6565Tie
TTFB534ms534msTie
Composite7171Tie
Performance
IIS
44
Microsoft IIS
44
Accessibility
IIS
88
Microsoft IIS
88
Security
IIS
65
Microsoft IIS
65
SEO
IIS
90
Microsoft IIS
90
Composite
IIS
71
Microsoft IIS
71

IIS and Microsoft IIS are closely matched, each leading in different categories. IIS has a composite score of 71 while Microsoft IIS scores 71.

When to choose IIS

IIS doesn't clearly lead Microsoft IIS in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

When to choose Microsoft IIS

Microsoft IIS doesn't clearly lead IIS in any category on the sampled sites — pick it based on developer experience, ecosystem, or existing team skills rather than the audit scores.

How this comparison was built

Scores are medians across 61 audited IIS sites and 61 audited Microsoft IIS 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 IIS?
Based on real BeaverCheck audits, IIS sites score higher on Lighthouse performance (44 vs 44 on average).
Which has better security, IIS or Microsoft IIS?
IIS sites score higher on security analysis (65 vs 65 on average).
Which has better accessibility, IIS or Microsoft IIS?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor IIS (88 vs 88). 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?
IIS sites score higher on Lighthouse SEO signals (90 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), IIS or Microsoft IIS?
IIS sites show lower Time to First Byte (534 ms vs 534 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 IIS 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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