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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aspeninstitute.org

https://aspeninstitute.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

aspeninstitute.org

Mobile

Sponsored

Hosting Provider

Pantheon

cloudflare.com

IP Address

104.18.14.86

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jean.ns.cloudflare.com.carlos.ns.cloudflare.com.

Performance

Page Speed

7.4 MB

109 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

React

CMS

WordPress

Infrastructure

Hosting

Pantheon

CDN

Cloudflare

Technology Stack

13 Technologies Detected

Analytics

Google Analytics

Google Analytics 4

Facebook Pixel

Plugins

Accessibility Checker Accessibility Checker Pro

Frameworks

Other

UI Components

CSS Frameworks

Tag Managers

Advertising

CDN

SEO Analysis

B76/100

aspeninstitute.orgaspeninstitute.org

Home - Aspen Institute

We drive change through dialogue, leadership, and action to help solve the greatest challenges of our time.

Title Length22 chars

Recommended: 50-60 chars

Description Length107 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (38/42)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

103 URLs

robots.txt

22 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

41%Poor

Interactive

HTTPS

WAF

45d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

03.01.2026

Valid Until

03.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

aspeninstitute.org*.aspeninstitute.org

SHA-256 Fingerprint

1A:7E:A5:35:62:99:13:1F:05:7D:44:7B:4B:26:7F:12:4F:88:A7:9C...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

3538

cache-control

🔵 1 Week(public, max-age=604800)

cf-apo-via

tcache

cf-cache-status

HIT

cf-edge-cache

cache,platform=wordpress

cf-ray🇩🇪 Frankfurt

9cf2b38f4e42e7b5-FRA

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

aspeninstitute-org.mail.protection.outlook.com

Domain Information

aspeninstitute.org

Domain Age

27y 2m

Created

23.12.1998

Expires

23.12.2026

Last Updated

01.06.2025

Registrar

Cloudflare, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

Avenir Next

88/100

Readability

/30

40/40

37px · LH 1.50

Hierarchy

/20

25/25

2.22x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Avenir Next

Sans83px

Body Font

Avenir Next

Sans37px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

83px

34px

24px

37px

✅ Excellent readability: 37px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.2x 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.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

Buy on MyFonts

Business & Marketing Stack

8 Tools Detected

Enterprise

CRM Systems

SalesforceEnterprise

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Ad platforms and retargeting pixels

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Social Media

Facebook SDKFree

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

aspeninstitute.org(12)pi.pardot.com(2)connect.facebook.net(2)googletagmanager.com(2)static.ads-twitter.com(1)

Website Identity

aspeninstitute.org

27 years old

Cloudflare, Inc.📧 Microsoft 365

Social Profiles

Facebook X (Twitter)Instagram LinkedIn YouTube

Sponsored

Last analyzed: 17 Feb 2026 at 04:57

Historical Analysis & Change Tracking