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.

Back to Search

atom.io

https://atom.io· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

atom.io

Mobile

Sponsored

Hosting Provider

GitHub Pages

pages.github.com

IP Address

140.82.112.18

Server Location

🇺🇸 San Francisco, United States

ASN

AS36459

Organization

GitHub, Inc.

Server

Nginx

CDN

Nameservers

dns1.p02.nsone.net.dns2.p02.nsone.net.dns3.p02.nsone.net.dns4.p02.nsone.net.

Performance

Page Speed

2.6 MB

29 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Tailwind CSS

CMS

WordPressv6.9.1

Infrastructure

Hosting

GitHub Pages

CDN

Technology Stack

4 Technologies Detected

Plugins

CSS Frameworks

Web Servers

SEO Analysis

C67/100

atom.ioatom.io

Sunsetting Atom - The GitHub Blog

We are archiving Atom and all projects under the Atom organization for an official sunset on December 15, 2022.

Title Length33 chars

Recommended: 50-60 chars

Description Length111 chars

Recommended: 120-160 chars

Issues (1)

• Many images missing alt text (11/18)

4 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

5 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

36d

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

Valid From

23.12.2025

Valid Until

23.03.2026

Subject Alternative Names (1)

github.blog

SHA-256 Fingerprint

40:15:75:4B:E2:8E:BE:72:90:B3:4F:D1:3A:4F:57:62:C5:D7:E5:7D...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

cache-control

🟡 300s(max-age=300, must-revalidate)

content-encoding

⚡ Brotli(br)

content-type

text/html; charset=UTF-8

date

Sat, 14 Feb 2026 12:53:57 GMT

host-header

a9130478a60e5f9135f765b23f26593b

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

atom.io

Domain Age

16y 1m

Created

06.01.2010

Expires

06.01.2027

Last Updated

10.12.2024

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Cookie consent banner detected

Data Protection Officer mentioned

Typography & Readability

Mona Sans

88/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

3x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Mona Sans

Sans48px

Body Font

Mona Sans

Sans16px

Contrast Ratio

Reading Comfort

~37 CPL

Needs attention

48px

16px

20px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.0x larger than 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.

Buy on MyFontsVariable Fonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

12 Resources

Scripts

Styles

Async

Defer

Top Script Sources

github.blog(5)ghcc.githubassets.com(1)js.monitor.azure.com(1)cdnjs.cloudflare.com(1)analytics.githubassets.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn GitHub TikTok

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Last analyzed: 14 Feb 2026 at 12:54

Historical Analysis & Change Tracking