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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overcast.fm

https://overcast.fm· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

overcast.fm

Mobile

Sponsored

Hosting Provider

Linode (Akamai)

linode.com

IP Address

45.79.46.187

Server Location

🇺🇸 Richardson, United States

ASN

AS63949

Organization

Linode

Server

Nginx

CDN

Cloudflare

WAF

Cloudflare

Nameservers

rocky.ns.cloudflare.com.tegan.ns.cloudflare.com.

Performance

Page Speed

17 KB

3 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Linode (Akamai)

CDN

Cloudflare

Technology Stack

4 Technologies Detected

Libraries

CSS Frameworks

Web Servers

Customer Support

SEO Analysis

D47/100

overcast.fmovercast.fm

Overcast

Podcast player app for iPhone, iPad, and Apple Watch.

Title Length8 chars

Recommended: 50-60 chars

Description Length53 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (2/3)

7 issues found

Upgrade to view details

Sponsored

A+

Security Score

98%Excellent

Static / Informational

HTTPS

No WAF

39d

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

26.12.2025

Valid Until

26.03.2026

Subject Alternative Names (2)

*.overcast.fmovercast.fm

SHA-256 Fingerprint

0E:A6:7F:67:B1:84:9E:4B:99:0E:94:5D:F1:55:5B:F3:AD:64:45:AC...

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-security-policy

default-src 'self' *.overcast-cdn.com; script-src 'self' *.o...

content-type

text/html; charset=utf-8

cross-origin-opener-policy

same-origin

date

Sun, 15 Feb 2026 07:50:46 GMT

referrer-policy

origin-when-cross-origin

Good Warning Issue

Email Infrastructure

Fastmail

Score

SPF

DKIM

DMARC

MX Records (2)

in2-smtp.messagingengine.com

in1-smtp.messagingengine.com

Domain Information

overcast.fm

Domain Age

12y 11m

Created

13.03.2013

Expires

13.03.2027

Last Updated

14.04.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

-apple-system

86/100

Readability

/30

32/40

16px · LH 1.33

Hierarchy

/20

21/25

2x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

-apple-system

Sans32px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

32px

24px

16px

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

✅ Strong hierarchy: Headlines are 2.0x 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.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Website Identity

Mastodon

Sponsored

Last analyzed: 15 Feb 2026 at 07:50

Historical Analysis & Change Tracking