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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pbslearningmedia.org

https://pbslearningmedia.org· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

54.225.198.196

Server Location

🇺🇸 Ashburn, United States

ASN

AS14618

Organization

AWS EC2 (us-east-1)

Server

Gunicorn

CDN

CloudFront

Nameservers

ns-1230.awsdns-25.org.ns-1674.awsdns-17.co.uk.ns-193.awsdns-24.com.ns-806.awsdns-36.net.

Performance

Page Speed

55 KB

58 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

CMS

Ghost

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

9 Technologies Detected

Analytics

CSS Frameworks

Frameworks

Libraries

Icon Libraries

Tag Managers

SEO Analysis

B76/100

pbslearningmedia.orgpbslearningmedia.org

PBS LearningMedia | Teaching Resources For Students And Teachers

Inspire your students with thousands of free teaching resources including videos, lesson plans, and games aligned to state and national standards.

Title Length64 chars

Recommended: 50-60 chars

Description Length146 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

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Crawlability

Sitemap

Type: index

19 URLs

robots.txt

29 rules

Sitemap reference found

Sponsored

Security Score

41%Poor

Interactive

HTTPS

No WAF

247d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.09.2025

Valid Until

23.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

pbslearningmedia.org*.pbslearningmedia.org

SHA-256 Fingerprint

EF:FB:95:90:FF:50:E2:38:01:AE:C8:C2:F8:C9:D2:49:F6:C9:13:FE...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self' https://*.nearpod.com/ https://nearpo...

content-type

text/html; charset=utf-8

date

Wed, 18 Feb 2026 09:42:46 GMT

etag

W/"82a87ba5275f185a015762497d3431d6"

server

gunicorn/20.0.4

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

pbslearningmedia.org

Domain Age

14y 9m

Created

10.05.2011

Expires

10.05.2026

Last Updated

11.05.2025

Registrar

CSC Corporate Domains, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

PBS Sans

58/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

25/25

3x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

PBS Sans

Sans42px

Body Font

PBS Sans

Sans14px

Contrast Ratio

Reading Comfort

~45 CPL

Optimal (45–75)

42px

32px

24px

14px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

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

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

⚠️ Risky: Text appears on background images without overlay protection.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

16 Resources

Scripts

Styles

Async

Defer

Top Script Sources

static.pbslearningmedia.org(9)googletagmanager.com(2)google-analytics.com(1)sb.scorecardresearch.com(1)

Website Identity

Facebook X (Twitter)Instagram Pinterest

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Last analyzed: 18 Feb 2026 at 09:43

Historical Analysis & Change Tracking