What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

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xiph.org

https://xiph.org· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

xiph.org

Mobile

Sponsored

Hosting Provider

University of Oregon

IP Address

140.211.166.31

Server Location

🇺🇸 Corvallis, United States

ASN

AS3701

Organization

University of Oregon

Server

Nginx

Nameservers

ns1.xiph.org.ns0.xiph.org.

Performance

Page Speed

17 KB

5 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

University of Oregon

Technology Stack

1 Technologies Detected

Web Servers

Nginxv1.22.1

SEO Analysis

F35/100

xiph.orgxiph.org

Xiph.org

No description available for this page.

Title Length8 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Missing viewport meta tag - page may not be mobile-friendly

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

60 rules

Allows all crawlers

Sponsored

Security Score

76%Good

Static / Informational

HTTPS

No WAF

69d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.01.2026

Valid Until

25.04.2026

Subject Alternative Names (2)

www.xiph.orgxiph.org

SHA-256 Fingerprint

02:E6:56:2B:04:1B:63:1A:81:5A:FE:E9:02:33:20:51:FE:CC:76:49...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html

date

Sun, 15 Feb 2026 01:46:49 GMT

server

nginx/1.22.1

strict-transport-security

max-age=63072000

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

MX Records (1)

smtp.osuosl.org

Domain Information

xiph.org

Domain Age

26y 9m

Created

10.05.1999

Expires

10.05.2026

Last Updated

11.02.2026

Registrar

Domain.com - Network Solutions, LLC

DNSSEC

Not Enabled

Typography & Readability

Verdana

65/100

Readability

/30

32/40

14px · LH 1.40

Hierarchy

/20

15/25

1.11x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Verdana

Sans16px

Body Font

Verdana

Sans14px

Contrast Ratio

Reading Comfort

~114 CPL

Needs attention

16px

13px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

⚠️ Wide lines: ~114 chars/line. Consider max-width for better reading flow.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

1 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Sponsored

Last analyzed: 15 Feb 2026 at 01:47

Historical Analysis & Change Tracking