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ASP.NET vs IIS

Based on 59 and 66 real audits

View ASP.NET details | View IIS details
MetricASP.NETIISWinner
Performance4545Tie
Accessibility8487IIS
Best Practices8484Tie
SEO8990IIS
Security6566IIS
TTFB551ms513msIIS
Composite7272Tie
Performance
ASP.NET
45
IIS
45
Accessibility
ASP.NET
84
IIS
87
Security
ASP.NET
65
IIS
66
SEO
ASP.NET
89
IIS
90
Composite
ASP.NET
72
IIS
72

IIS outperforms ASP.NET in 4 of 7 categories, with a stronger composite score (72 vs 72). ASP.NET leads in no categories.

When to choose ASP.NET

ASP.NET 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.

When to choose IIS

Choose IIS 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 59 audited ASP.NET sites and 66 audited 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, ASP.NET or IIS?
Based on real BeaverCheck audits, ASP.NET sites score higher on Lighthouse performance (45 vs 45 on average).
Which has better security, ASP.NET or IIS?
IIS sites score higher on security analysis (66 vs 65 on average).
Which has better accessibility, ASP.NET or IIS?
Accessibility scores measured by Lighthouse WCAG 2.1 checks favor IIS (87 vs 84). 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, ASP.NET or IIS?
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), ASP.NET or IIS?
IIS sites show lower Time to First Byte (513 ms vs 551 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 ASP.NET or IIS for my website?
Both platforms have trade-offs. ASP.NET scores higher on overall composite score while ASP.NET 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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