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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sendgrid.com

https://sendgrid.com· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

sendgrid.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.66.59.232

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS16509

Organization

AWS EC2 (eu-central-1)

Server

Nginx

CDN

Fastly

Nameservers

ns13.dnsmadeeasy.com.ns15.dnsmadeeasy.com.ns14.dnsmadeeasy.com.ns12.dnsmadeeasy.com.+2 more

Performance

Page Speed

1.3 MB

50 requests

Image Optimization

Lazy LoadWebP

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

9 Technologies Detected

CSS Frameworks

Analytics

Libraries

Tag Managers

Email Marketing

Advertising

Microsoft Advertising

Web Servers

Nginx

SEO Analysis

A+94/100

sendgrid.comsendgrid.com

SendGrid Email API and Email Marketing Campaigns | SendGrid

Send at scale with SendGrid’s trusted email API and marketing campaigns platform, delivering 148+ billion emails for senders like you every month.

Title Length59 chars

Recommended: 50-60 chars

Description Length146 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

1,273 URLs

robots.txt

3 rules

Sponsored

A+

Security Score

98%Excellent

Static / Informational

HTTPS

No WAF

22d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

GoDaddy.com, Inc.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

05.02.2025

Valid Until

09.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.sendgrid.comsendgrid.com

SHA-256 Fingerprint

51:0A:36:2A:94:F5:9F:96:98:69:61:E8:BA:B9:1C:8D:68:88:DC:73...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

cache-control

🟡 600s(max-age=600,stale-if-error=7200)

content-encoding

📦 Gzip(gzip)

content-length

71814

content-security-policy

frame-ancestors 'self'

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mxa-0023de01.gslb.pphosted.com

mxb-0023de01.gslb.pphosted.com

Domain Information

sendgrid.com

Domain Age

16y 10m

Created

20.04.2009

Expires

20.04.2028

Last Updated

24.11.2022

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

TrustArc

Cookie Consent Banner

TrustArc

GDPR Indicators

Cookie consent banner detected

CMP: TrustArc

Data Protection Officer mentioned

Typography & Readability

Whitney SSm

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Whitney SSm

Sans48px

Body Font

Whitney SSm

Sans16px

Contrast Ratio

Reading Comfort

~41 CPL

Needs attention

48px

40px

28px

14px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than body text.

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

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

⚠️ Cramped layout: 33 elements lack adequate spacing.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

TrustArcEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

23 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(7)consent.trustarc.com(3)bat.bing.com(2)gstatic.com(1)googletagmanager.com(1)

Website Identity

Facebook X (Twitter)LinkedIn GitHub

Sponsored

Last analyzed: 15 Feb 2026 at 06:18

Historical Analysis & Change Tracking