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.

Back to Search

archive.org

https://archive.org· First analyzed 10 Feb 2026· Updated 10 Feb 2026

Export

archive.org

Mobile

Sponsored

Hosting Provider

Internet Archive

IP Address

207.241.224.2

Server Location

🇺🇸 San Francisco, United States

ASN

AS7941

Organization

Internet Archive

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns0036.secondary.cloudflare.com.ns2.archive.org.ns0208.secondary.cloudflare.com.ns1.archive.org.+2 more

Performance

Page Speed

401 KB

83 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Medium

Technology Stack

1 Technologies Detected

Web Servers

Nginxv1.24.0

SEO Analysis

D43/100

archive.orgarchive.org

Internet Archive: Digital Library of Free & Borrowable Texts, Movie...

Internet Archive is a non-profit digital library offering free universal access to texts, movies & music, as well as 624 billion archived web pages.

Title truncated.

Title Length93 chars

Recommended: 50-60 chars

Description Length148 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

5 issues found

Upgrade to view details

Sponsored

Security Score

83%Very Good

Static / Informational

HTTPS

No WAF

364d

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

cache-control

🟡 900s(max-age=900)

content-encoding

📦 Gzip(gzip)

content-security-policy

report-uri https://archive.org/services/csp-report; default-...

content-type

text/html; charset=utf-8

date

Tue, 10 Feb 2026 18:12:46 GMT

expires

Tue, 10 Feb 2026 18:27:46 GMT

Good Warning Issue

Typography & Readability

Helvetica Neue

58/100

Readability

/30

20/40

10px · LH 1.43

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Body Font

Helvetica Neue

Sans10px

Contrast Ratio

Reading Comfort

Single Family

left aligned

❌ Critical: 10px body text is too small. Increase to at least 14px.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

5 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)apollo.archive.org(1)

Sponsored

Last analyzed: 10 Feb 2026 at 18:12

Historical Analysis & Change Tracking