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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?

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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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criterion.com

https://criterion.com· First analyzed 18 Feb 2026· Updated 18 Feb 2026

Export

criterion.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.40.190

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

serenity.ns.cloudflare.com.donovan.ns.cloudflare.com.

Performance

Page Speed

319 KB

37 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

6 Technologies Detected

Analytics

CSS Frameworks

Tag Managers

Comments

CDN

SEO Analysis

C62/100

criterion.comcriterion.com

The Criterion Collection

Discover important classic and contemporary cinema from around the world. Browse our continuing series of Blu-ray and DVD editions, featuring award-winning s...

Description truncated.

Title Length24 chars

Recommended: 50-60 chars

Description Length178 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (4/7)

5 issues found

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Crawlability

Sitemap

robots.txt

1 rules

Allows all crawlers

Sponsored

Security Score

26%Critical

Interactive

HTTPS

WAF

76d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.02.2026

Valid Until

06.05.2026

Subject Alternative Names (2)

*.criterion.comcriterion.com

SHA-256 Fingerprint

AB:65:DD:38:A2:39:D5:0D:50:F9:B1:4B:4C:E8:E9:CD:1E:90:1D:62...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

date

Wed, 18 Feb 2026 09:15:38 GMT

content-type

text/html; charset=UTF-8

cache-control

🔴 No Cache(max-age=0, must-revalidate, no-cache, no-store, private)

expires

Fri, 01 Jan 1990 00:00:00 GMT

nel

{"report_to":"heroku-nel", "response_headers":["Via"], "max_...

pragma

no-cache

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

aspmx5.googlemail.com

alt2.aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx.l.google.com

+3 more

Domain Information

criterion.com

Domain Age

32y 4m

Created

25.10.1993

Expires

24.10.2029

Last Updated

25.09.2024

Registrar

GoDaddy.com, LLC

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Data Protection Officer mentioned

Typography & Readability

MercuryDisplayRegular + MercuryTextG1Regular

58/100

Readability

/30

40/40

16px · LH 1.60

Hierarchy

/20

18/25

5x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

MercuryDisplayRegular

Sans80px

Body Font

MercuryTextG1Regular

Sans16px

Contrast Ratio

Reading Comfort

~79 CPL

Optimal (45–75)

80px

18px

13px

14px

16px

✅ Excellent readability: 16px body text is ideal for all devices.

✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 5.0x larger than body text.

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

✅ Optimal line length: ~78 characters per line is comfortable to read.

⚠️ Cramped layout: 12 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

googletagmanager.com(3)cdn.cookielaw.org(2)criterion.com(1)the-criterion-collection.disqus.com(1)local(1)

Website Identity

criterion.com

32 years old

GoDaddy.com, LLC📧 Google Workspace

Social Profiles

Facebook X (Twitter)Instagram YouTube

Sponsored

Last analyzed: 18 Feb 2026 at 09:16

Historical Analysis & Change Tracking