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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srf.ch

https://srf.ch· First analyzed 13 Feb 2026· Updated 13 Feb 2026

Export

srf.ch

Mobile

Sponsored

Hosting Provider

Enflow B.V

IP Address

89.106.200.1

Server Location

🇳🇱 Alphen aan den Rijn, The Netherlands

ASN

AS209626

Organization

Enflow B.V

CDN

Akamai

WAF

Akamai

Nameservers

dns4.p07.nsone.net.ns-1490.awsdns-58.org.ns-1660.awsdns-15.co.uk.ns-181.awsdns-22.com.+4 more

Performance

Page Speed

1.1 MB

88 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Enflow B.V

CDN

Akamai

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Meta Frameworks

Astro

CSS Frameworks

Tailwind CSS

Customer Support

Zendesk

SEO Analysis

A82/100

srf.chsrf.ch

Schweizer Radio und Fernsehen (SRF)

Steigen Sie ein in das Angebot aus Audios, Videos, Nachrichten und allen Sendungen von Schweizer Radio und Fernsehen.

Title Length35 chars

Recommended: 50-60 chars

Description Length117 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (84/107)

2 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

23 rules

Sitemap reference found

Sponsored

Security Score

71%Good

Interactive

HTTPS

WAF

37d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

23.12.2025

Valid Until

23.03.2026

Subject Alternative Names (1)

www.srf.ch

SHA-256 Fingerprint

5E:E4:D8:56:E9:DD:67:A2:74:90:F2:57:A2:F7:7B:87:ED:1E:97:F2...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-origin

alt-svc

h3=":443"; ma=93600

cache-control

🟡 31s(public, max-age=31)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Fri, 13 Feb 2026 12:58:51 GMT

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

SPF

DKIM

DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

srf-ch.mail.protection.outlook.com

Domain Information

srf.ch

DNSSEC

Not Enabled

Privacy & Compliance

Usercentrics

Cookie Consent Banner

Usercentrics

GDPR Indicators

Cookie consent banner detected

CMP: Usercentrics

Data Protection Officer mentioned

Typography & Readability

SRG_SSR_Text_VF

71/100

Readability

/30

32/40

18px · LH 1.25

Hierarchy

/20

16/25

1.78x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

SRG_SSR_Text_VF

Sans32px

Body Font

SRG_SSR_Text_VF

Sans18px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

32px

24px

21px

18px

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Good hierarchy: Clear distinction between headlines and 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.

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

⚠️ Cramped layout: 65 elements lack adequate spacing.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

17 Resources

Scripts

Styles

Async

Defer

Top Script Sources

app.usercentrics.eu(2)local(2)static.chartbeat.com(2)s.go-mpulse.net(1)

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Last analyzed: 13 Feb 2026 at 12:59

Historical Analysis & Change Tracking