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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jsbin.com

https://jsbin.com· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

jsbin.com

Mobile

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.67.195.200

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

sara.ns.cloudflare.com.phil.ns.cloudflare.com.

Performance

Page Speed

4 KB

31 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web Manifest

Technology Stack

12 Technologies Detected

Analytics

Libraries

Frameworks

Other

Other

Other

Other

CSS Frameworks

CDN

SEO Analysis

D47/100

jsbin.comjsbin.com

JS Bin - Collaborative JavaScript Debugging

A live pastebin for HTML, CSS & JavaScript and a range of processors, including SCSS, CoffeeScript, Jade and more...

Title Length43 chars

Recommended: 50-60 chars

Description Length116 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (5/7)

6 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

3 rules

Allows all crawlers

Sponsored

Security Score

36%Critical

Interactive

HTTPS

WAF

74d

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+H3

Valid From

29.01.2026

Valid Until

29.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

jsbin.com*.jsbin.com

SHA-256 Fingerprint

48:54:15:2B:DD:0F:B0:98:C5:51:7B:35:E8:51:EA:CE:45:54:16:F6...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

server

cloudflare

date

Fri, 13 Feb 2026 19:29:38 GMT

content-type

text/html; charset=utf-8

set-cookie

jsbin

x-frame-options

DENY

nel

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

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

MX Records (5)

aspmx3.googlemail.com

aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx2.googlemail.com

+1 more

Domain Information

jsbin.com

Domain Age

17y 4m

Created

28.09.2008

Expires

28.09.2034

Last Updated

29.01.2026

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Helvetica Neue

48/100

Readability

/30

17/40

14px · LH 1.14

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans14px

Contrast Ratio

Reading Comfort

Single Font Family

left aligned

14px

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

⚠️ Tight line spacing (1.14). Consider 1.4-1.6 for better readability.

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

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

✅ Protected text on images: Using gradient for readability.

⚠️ Cramped layout: 10 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

google-analytics.com(2)static.jsbin.com(2)jsbin.com(2)googletagmanager.com(1)

Website Identity

X (Twitter)GitHub

Sponsored

Last analyzed: 13 Feb 2026 at 19:30

Historical Analysis & Change Tracking