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

brew.sh

https://brew.sh· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

brew.sh

Mobile

Sponsored

Hosting Provider

GitHub Pages

pages.github.com

IP Address

185.199.111.153

Server Location

🇺🇸 San Francisco, United States

ASN

AS54113

Organization

GitHub, Inc

Server

GitHub.com

CDN

Fastly

Nameservers

ns3.dnsimple.com.ns4.dnsimple-edge.org.ns1.dnsimple.com.ns2.dnsimple-edge.net.

Performance

Page Speed

9 KB

6 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Cargo

Technology Stack

1 Technologies Detected

Fonts

Google Fonts

SEO Analysis

A+90/100

brew.shbrew.sh

Homebrew — The Missing Package Manager for macOS (or Linux)

The Missing Package Manager for macOS (or Linux).

Title Length59 chars

Recommended: 50-60 chars

Description Length49 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

89 URLs

robots.txt

4 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

76%Good

Static / Informational

HTTPS

No WAF

50d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

04.01.2026

Valid Until

04.04.2026

Subject Alternative Names (2)

brew.shwww.brew.sh

SHA-256 Fingerprint

18:DE:A9:4D:02:F5:11:42:53:38:BA:BB:C3:1C:FC:C3:0E:42:8F:FD...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-origin

age

435

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

5411

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (5)

alt4.aspmx.l.google.com

aspmx.l.google.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

brew.sh

DNSSEC

Not Enabled

Typography & Readability

ui-sans-serif

84/100

Readability

/30

32/40

15px · LH 1.40

Hierarchy

/20

25/25

4.2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

ui-sans-serif

Sans63px

Body Font

ui-sans-serif

Sans15px

Contrast Ratio

Reading Comfort

~42 CPL

Needs attention

63px

45px

15px

⚠️ Small text: 15px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.2x larger than body text.

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

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

⚠️ Inconsistent alignment: Mix of left/center/right creates visual noise.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

3 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdnjs.cloudflare.com(2)

Website Identity

GitHub

Sponsored

Last analyzed: 13 Feb 2026 at 02:00

Historical Analysis & Change Tracking