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.

Back to Search

rcsb.org

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

Export

rcsb.org

Sponsored

Hosting Provider

Rutgers, The State University

IP Address

128.6.159.193

Server Location

🇺🇸 Piscataway, United States

ASN

AS46

Organization

Rutgers, The State University

Nameservers

dns2.p03.nsone.net.dns3.p03.nsone.net.dns4.p03.nsone.net.dns1.p03.nsone.net.

Performance

Page Speed

284 KB

119 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Rutgers, The State University

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

Analytics

CSS Frameworks

Libraries

UI Components

Icon Libraries

Frameworks

SEO Analysis

D47/100

rcsb.orgrcsb.org

RCSB PDB: Homepage

As a member of the wwPDB, the RCSB PDB curates and annotates PDB data according to agreed upon standards. The RCSB PDB also provides a variety of tools and r...

Description truncated.

Title Length18 chars

Recommended: 50-60 chars

Description Length397 chars

Recommended: 120-160 chars

Issues (2)

• Missing H1 tag - every page should have one H1
• Many images missing alt text (55/96)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

14 rules

Sponsored

Security Score

36%Critical

Interactive

HTTPS

No WAF

275d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Internet2

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

19.11.2025

Valid Until

19.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (7)

www.rcsb.orgrcsb.orgsierra.east.k8s.rcsb.orgsierra.k8s.rcsb.orgsierra.west.k8s.rcsb.orgwww1.rcsb.orgwww2.rcsb.org

SHA-256 Fingerprint

54:9A:3F:62:1F:CD:9A:9C:7B:5F:34:C7:1A:6B:99:5F:84:94:C9:EE...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443";ma=60;

cache-control

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

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=utf-8

date

Tue, 17 Feb 2026 22:16:20 GMT

etag

W/"17148-KAmSW7cBYA4/KmK15UYYPG/ouVw"

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt3.aspmx.l.google.com

alt4.aspmx.l.google.com

aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

rcsb.org

Domain Age

27y 12m

Created

27.02.1998

Expires

26.02.2027

Last Updated

03.01.2024

Registrar

Network Solutions, LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

Helvetica Neue

76/100

Readability

/30

40/40

16px · LH 1.43

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Helvetica Neue

Sans

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

30px

20px

16px

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

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

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

⚠️ Cramped layout: 29 elements lack adequate spacing.

Business & Marketing Stack

3 Tools Detected

Growing

Behavior Analytics

HotjarMid-Market

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(6)cdn.rcsb.org(3)googletagmanager.com(1)static.hotjar.com(1)script.hotjar.com(1)

Website Identity

Facebook X (Twitter)LinkedIn YouTube GitHub Bluesky

Sponsored

Last analyzed: 17 Feb 2026 at 22:16

Historical Analysis & Change Tracking