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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slimframework.com

https://slimframework.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

slimframework.com

Mobile

Sponsored

Hosting Provider

Gandi

gandi.net

IP Address

217.70.184.55

Server Location

🇫🇷 Paris, France

ASN

AS29169

Organization

Gandi France L/B Services

Server

GitHub.com

CDN

Fastly

Nameservers

ns-83-c.gandi.net.ns-132-a.gandi.net.ns-103-b.gandi.net.

Performance

Page Speed

153 KB

21 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Bootstrap

Infrastructure

Hosting

Gandi

CDN

Fastly

Technology Stack

8 Technologies Detected

CSS Frameworks

Bootstrapv3.3.5

Tailwind CSS

Fonts

Google Fonts Adobe Fonts (Typekit)

Libraries

Icon Libraries

Analytics

Payments

SEO Analysis

D56/100

slimframework.comslimframework.com

Slim Framework - Slim Framework

Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.

Title Length31 chars

Recommended: 50-60 chars

Description Length105 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (1/1)

6 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

227 URLs

robots.txt

1 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

0%Critical

Critical / Transactional

HTTPS

No WAF

42d

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

31.12.2025

Valid Until

31.03.2026

Subject Alternative Names (1)

www.slimframework.com

SHA-256 Fingerprint

E4:47:8B:2F:95:64:5E:23:F2:DC:77:68:66:57:57:80:9E:B5:F4:B9...

Top 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

cache-control

🟡 600s(max-age=600)

content-encoding

📦 Gzip(gzip)

content-length

3944

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

spool.mail.gandi.net

fb.mail.gandi.net

Domain Information

slimframework.com

Domain Age

15y 3m

Created

30.10.2010

Expires

30.10.2028

Last Updated

12.04.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

Lato + Helvetica Neue

89/100

Readability

/30

40/40

21px · LH 1.40

Hierarchy

/20

16/25

1.71x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Lato

Sans36px

Body Font

Helvetica Neue

Sans21px

Contrast Ratio

Reading Comfort

~35 CPL

Needs attention

36px

30px

24px

21px

✅ Excellent readability: 21px body text is ideal for all devices.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Good hierarchy: Clear distinction between headlines and body text.

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

GGoogle Fonts AAdobe Fonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

platform.twitter.com(1)ssl.google-analytics.com(1)use.typekit.net(1)ajax.googleapis.com(1)maxcdn.bootstrapcdn.com(1)

Website Identity

GitHub

Sponsored

Last analyzed: 17 Feb 2026 at 09:35

Historical Analysis & Change Tracking