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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aflcio.org

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

Export

aflcio.org

Sponsored

Hosting Provider

Pantheon

cloudflare.com

IP Address

172.67.82.124

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

bayan.ns.cloudflare.com.tess.ns.cloudflare.com.

Performance

Page Speed

26 MB

53 requests

Image Optimization

Lazy Load

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Drupal

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

8 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel Lucky Orange

CSS Frameworks

Icon Libraries

Tag Managers

CDN

SEO Analysis

C64/100

aflcio.orgaflcio.org

America's Unions | AFL-CIO

The AFL-CIO is an expression of the hopes and aspirations of the working people of America. We resolve to fulfill the yearning of the human spirit for libert...

Description truncated.

Title Length26 chars

Recommended: 50-60 chars

Description Length469 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

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Crawlability

Sitemap

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

61%Fair

Interactive

HTTPS

WAF

64d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

23.01.2026

Valid Until

23.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

aflcio.org*.aflcio.org

SHA-256 Fingerprint

2F:FC:34:DC:35:4F:A1:11:DA:77:74:BC:F0:28:E7:C7:DC:9F:83:F8...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 04:29:54 GMT

content-type

text/html; charset=UTF-8

cache-control

🟡 300s(max-age=300, public)

report-to

{"group":"cf-nel", "max_age":604800, "endpoints":[{"url":"ht...

content-language

nel

{"report_to":"cf-nel", "success_fraction":0.0, "max_age":604...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt4.aspmx.l.google.com

alt2.aspmx.l.google.com

aspmx.l.google.com

alt3.aspmx.l.google.com

+1 more

Domain Information

aflcio.org

Domain Age

30y 10m

Created

23.04.1995

Expires

24.04.2027

Last Updated

08.12.2023

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Data subject rights referenced

Typography & Readability

Helvetica Neue

58/100

Readability

/30

40/40

18px · LH 1.61

Hierarchy

/20

18/25

4x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Helvetica Neue

Sans72px

Body Font

Helvetica Neue

Sans18px

Contrast Ratio

Reading Comfort

~61 CPL

Optimal (45–75)

72px

30px

27px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.61 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

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

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

✅ Optimal line length: ~61 characters per line is comfortable to read.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)googletagmanager.com(2)connect.facebook.net(2)google-analytics.com(1)tools.luckyorange.com(1)

Website Identity

Facebook X (Twitter)Instagram TikTok Threads Bluesky

Sponsored

Last analyzed: 18 Feb 2026 at 04:30

Historical Analysis & Change Tracking