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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fosstodon.org

https://fosstodon.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

fosstodon.org

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.131.52

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

Server

Mastodon

CDN

Fastly

Nameservers

dns44.cloudns.net.dns41.cloudns.net.dns43.cloudns.net.dns42.cloudns.net.

Performance

Page Speed

1.4 MB

140 requests

Image Optimization

WebPAVIFResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Substack

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

1 Technologies Detected

CSS Frameworks

Tailwind CSS

SEO Analysis

D50/100

fosstodon.orgfosstodon.org

Trending - Fosstodon

Fosstodon is an invite only Mastodon instance that is open to those who are interested in technology; particularly free & open source software. If you wish ...

Description truncated.

Title Length20 chars

Recommended: 50-60 chars

Description Length191 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (4/5)

6 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

6 rules

Sponsored

Security Score

81%Very Good

Interactive

HTTPS

No WAF

72d

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+H3

Valid From

30.01.2026

Valid Until

30.04.2026

Subject Alternative Names (2)

*.fosstodon.orgfosstodon.org

SHA-256 Fingerprint

DC:DB:35:B6:DA:BC:D2:27:64:5F:6A:A2:3F:A4:90:09:8F:B6:02:C3...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

age

alt-svc

h3=":443";ma=86400,h3-29=":443";ma=86400,h3-27=":443";ma=864...

cache-control

🟡 15s(max-age=15, public, stale-while-revalidate=30, stale-if-erro...)

content-encoding

📦 Gzip(gzip)

content-length

15540

Good Warning Issue

Email Infrastructure

Zoho Mail

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (3)

mx.zoho.eu

mx3.zoho.eu

mx2.zoho.eu

Domain Information

fosstodon.org

Domain Age

8y 6m

Created

30.07.2017

Expires

30.07.2028

Last Updated

16.08.2023

Registrar

NameCheap, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

mastodon-font-sans-serif

45/100

Readability

/30

12/40

13px · LH 1.38

Hierarchy

/20

8/25

1.23x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

mastodon-font-sans-serif

Sans16px

Body Font

mastodon-font-sans-serif

Sans13px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

16px

13px

❌ Critical: 13px body text is too small. Increase to at least 14px.

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

✅ 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.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

9 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(3)

Website Identity

GitHub

Sponsored

Last analyzed: 17 Feb 2026 at 04:08

Historical Analysis & Change Tracking