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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rebrandly.com

https://rebrandly.com· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

rebrandly.com

Mobile

Sponsored

Hosting Provider

Webflow

webflow.com

IP Address

198.202.211.1

Server Location

🇺🇸 San Francisco, United States

ASN

AS209242

Organization

Webflow, Inc

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

ns-587.awsdns-09.net.ns-84.awsdns-10.com.ns-1316.awsdns-36.org.ns-1942.awsdns-50.co.uk.

Performance

Page Speed

15 KB

107 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Webflow

CDN

Cloudflare

Technology Stack

11 Technologies Detected

Analytics

Customer Support

Libraries

Other

CSS Frameworks

Fonts

Tag Managers

CDN

Security

SEO Analysis

A+90/100

rebrandly.comrebrandly.com

Free link shortener for branded URLs, analytics & QR codes

Best link shortener for marketing teams. Create branded short URLs, track campaign performance, and boost clicks with custom domains. Start for free.

Title Length58 chars

Recommended: 50-60 chars

Description Length149 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

71%Good

Interactive

HTTPS

WAF

72d

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

02.02.2026

Valid Until

03.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

www.rebrandly.com

SHA-256 Fingerprint

08:C5:3F:4C:5B:C0:0C:8F:40:47:63:BA:45:3A:C7:53:C1:1C:EB:DA...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9d0852b52e06d34e-FRA

content-encoding

📦 Gzip(gzip)

content-security-policy

frame-ancestors 'self'

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt2.aspmx.l.google.com

aspmx.l.google.com

alt3.aspmx.l.google.com

alt4.aspmx.l.google.com

+1 more

Domain Information

rebrandly.com

Domain Age

11y 5m

Created

12.09.2014

Expires

12.09.2026

Last Updated

14.01.2026

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Termly

Cookie Consent Banner

Termly

GDPR Indicators

Cookie consent banner detected

CMP: Termly

Typography & Readability

Arial + sans-serif

90/100

Readability

/30

40/40

20px · LH 1.50

Hierarchy

/20

25/25

5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Arial

Sans100px

Body Font

sans-serif

Sans20px

Contrast Ratio

Reading Comfort

~36 CPL

Needs attention

100px

32px

28px

18px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

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

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

✅ Clean layout: Consistent left alignment throughout.

GGoogle Fonts Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Customer Support

IntercomMid-Market

Live chat and helpdesk tools

Behavior Analytics

Google Tag ManagerFree

Microsoft ClarityFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

TermlySMB

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

15 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdn.rebrandly.com(2)widget.intercom.io(1)ajax.googleapis.com(1)cdn.intellimize.co(1)app.termly.io(1)

Website Identity

Facebook Instagram LinkedIn

Sponsored

Last analyzed: 19 Feb 2026 at 19:56

Historical Analysis & Change Tracking