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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alternativeto.net

https://alternativeto.net· First analyzed 16 Feb 2026· Updated 16 Feb 2026

Export

alternativeto.net

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

172.66.40.84

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

jasmine.ns.cloudflare.com.bill.ns.cloudflare.com.

Performance

Page Speed

671 KB

146 requests

Image Optimization

Lazy LoadWebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

🔀 Hybrid

Frontend

Framework

Next.js

Styling

Tailwind CSS

CMS

Ghost

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch Icon

Technology Stack

15 Technologies Detected

Advertising

Google Ads Google AdSense Criteo Outbrain

Analytics

Meta Frameworks

CSS Frameworks

Icon Libraries

Fonts

Tag Managers

Payments

CDN

SEO Analysis

A82/100

alternativeto.netalternativeto.net

AlternativeTo - Crowdsourced software recommendations | AlternativeTo

AlternativeTo lets you find apps and software for Windows, Mac, Linux, iPhone, iPad, Android, Android Tablets, Web Apps, Online, Windows Tablets and more by ...

Description truncated.

Title Length69 chars

Recommended: 50-60 chars

Description Length208 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

38 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

30%Critical

Critical / Transactional

HTTPS

WAF

86d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Google Trust Services

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

12.02.2026

Valid Until

13.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

alternativeto.netog.alternativeto.net

SHA-256 Fingerprint

7F:61:6C:4F:3E:DE:D5:F4:18:A7:D4:14:D3:27:45:0B:1A:70:8B:A9...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

date

Mon, 16 Feb 2026 07:26:51 GMT

content-type

text/html; charset=utf-8

cache-control

🔴 No Cache(no-store, must-revalidate, no-cache, max-age=0, private)

server-timing

cfCacheStatus;desc="DYNAMIC", cfEdge;dur=8, cfOrigin;dur=242

set-cookie

vary

rsc, next-router-state-tree, next-router-prefetch, next-rout...

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

aspmx.l.google.com

alt1.aspmx.l.google.com

aspmx3.googlemail.com

alt2.aspmx.l.google.com

+3 more

Domain Information

alternativeto.net

Domain Age

18y 1m

Created

18.01.2008

Expires

18.01.2032

Last Updated

23.11.2025

Registrar

1API GmbH

DNSSEC

Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner

Quantcast Choice

GDPR Indicators

Cookie consent banner detected

CMP: Quantcast Choice

Data Protection Officer mentioned

Legitimate interest basis mentioned

Typography & Readability

Open Sans + IBM Plex Sans

50/100

Readability

/30

32/40

14px · LH 1.50

Hierarchy

/20

15/25

1.29x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Open Sans

Sans18px

Body Font

IBM Plex Sans

Sans14px

Contrast Ratio

Reading Comfort

~69 CPL

Optimal (45–75)

18px

40px

21px

14px

Perfect Fourth

Scale

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

⚠️ Weak hierarchy: Headlines should be at least 2x body size for clear visual structure.

✅ Good performance: Using 2 font families keeps load times fast.

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

⚠️ Risky: Text appears on background images without overlay protection.

GGoogle Fonts

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Google AdsEnterprise

Ad platforms and retargeting pixels

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(18)pagead2.googlesyndication.com(1)googletagmanager.com(1)

Website Identity

alternativeto.net

18 years old

1API GmbH📧 Google Workspace

Social Profiles

X (Twitter)Instagram LinkedIn Discord Bluesky

Sponsored

Last analyzed: 16 Feb 2026 at 07:27

Historical Analysis & Change Tracking