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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99percentinvisible.org

https://99percentinvisible.org· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

188.114.97.3

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

CloudFlare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jim.ns.cloudflare.com.sara.ns.cloudflare.com.

Performance

Page Speed

1.9 MB

55 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPressv6.9.1

cms

Invisiblev1.0.0

by Duck Brigade

View Theme

Technology Stack

10 Technologies Detected

Plugins

Libraries

CSS Frameworks

Icon Libraries

Analytics

Tag Managers

Popups & Forms

CDN

SEO Analysis

B70/100

99percentinvisible.org99percentinvisible.org

99% Invisible

No description available for this page.

Title Length13 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

• Missing meta description - important for click-through rates
• Many images missing alt text (10/13)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

8 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

26%Critical

Interactive

HTTPS

WAF

49d

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+H3

Valid From

09.01.2026

Valid Until

09.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

99percentinvisible.org*.99percentinvisible.org

SHA-256 Fingerprint

E4:9C:A8:7F:A6:67:E8:97:79:AB:C0:47:DC:57:9B:19:C5:55:C5:20...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin

http://localhost:3000

age

alt-svc

h3=":443"; ma=86400

cache-control

🟡 0s(max-age=0, s-maxage=2592000)

cache-provider

CLOUDWAYS-CACHE-DE

cf-cache-status

DYNAMIC

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

alt3.aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

99percentinvisible.org

Domain Age

15y 9m

Created

04.05.2010

Expires

04.05.2029

Last Updated

04.05.2019

Registrar

Tucows Domains Inc.

DNSSEC

Not Enabled

Privacy & Compliance

OneTrust

Cookie Consent Banner

OneTrust

GDPR Indicators

Cookie consent banner detected

CMP: OneTrust

Typography & Readability

Slabo 13px + Open Sans

55/100

Readability

/30

24/40

14px · LH 2.00

Hierarchy

/20

8/25

1.14x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Slabo 13px

Sans16px

Body Font

Open Sans

Sans14px

Contrast Ratio

Reading Comfort

~46 CPL

Optimal (45–75)

16px

29px

18px

12px

14px

Minor Second

Scale

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

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 2 font families keeps load times fast.

✅ Protected text on images: Using gradient for readability.

✅ Optimal line length: ~46 characters per line is comfortable to read.

⚠️ Cramped layout: 79 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

13 Resources

Scripts

Styles

Async

Defer

Top Script Sources

99percentinvisible.org(6)googletagmanager.com(1)load.sumo.com(1)cdn.cookielaw.org(1)code.iconify.design(1)

Website Identity

Instagram TikTok Discord Reddit Threads Bluesky

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Last analyzed: 19 Feb 2026 at 16:22

Historical Analysis & Change Tracking