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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onesignal.com

https://onesignal.com· First analyzed 20 Feb 2026· Updated 20 Feb 2026

Export

onesignal.com

Sponsored

Hosting Provider

Cloudflare

cloudflare.com

IP Address

104.16.160.145

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

gail.ns.cloudflare.com.vin.ns.cloudflare.com.

Performance

Page Speed

244 KB

90 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Framework

jQuery

Styling

Tailwind CSS

Infrastructure

Hosting

Cloudflare

CDN

Cloudflare

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

12 Technologies Detected

CSS Frameworks

Analytics

Libraries

UI Components

Other

Fonts

Tag Managers

Advertising

Other

CDN

SEO Analysis

A+94/100

onesignal.comonesignal.com

Customer Engagement Platform for Email, Push… - OneSignal

The world's leader for mobile push notifications, web push, SMS, email and in-app messaging. Trusted by 2 million+ businesses to send 12 billion+ messages per…

Title Length57 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (0)

1 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

robots.txt

14 rules

Sitemap reference found

Sponsored

Security Score

56%Poor

Interactive

HTTPS

WAF

85d

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

15.02.2026

Valid Until

16.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (1)

onesignal.com

SHA-256 Fingerprint

23:3B:A1:19:08:88:7E:6B:5C:C3:4F:FF:89:B2:11:CD:9D:95:B2:A0...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

alt-svc

h3=":443"; ma=86400

cache-control

🟡 1 Hours(max-age=3600, stale-while-revalidate=300, stale-if-error=360...)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9d0c384d78264db1-FRA

content-encoding

⚡ Brotli(br)

Good Warning Issue

Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt3.aspmx.l.google.com

alt1.aspmx.l.google.com

alt2.aspmx.l.google.com

aspmx.l.google.com

+1 more

Domain Information

onesignal.com

Domain Age

14y 5m

Created

10.09.2011

Expires

10.09.2027

Last Updated

02.08.2023

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Data Protection Officer mentioned

Typography & Readability

-apple-system

86/100

Readability

/30

40/40

16px · LH 1.63

Hierarchy

/20

25/25

4x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

-apple-system

Sans64px

Body Font

-apple-system

Sans16px

Contrast Ratio

Reading Comfort

~34 CPL

Needs attention

64px

18px

16px

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

✅ Optimal line spacing: 1.62 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.0x larger than body text.

✅ Good performance: Using 2 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.

GGoogle Fonts

Business & Marketing Stack

9 Tools Detected

Enterprise

Marketing Automation

MarketoEnterprise

Email marketing and automation platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

HotjarMid-Market

User behavior and product analytics

Lead Generation

LeadfeederMid-Market

Popups, forms, and lead capture tools

Advertising

LinkedIn AdsEnterprise

Reddit PixelMid-Market

Quora PixelMid-Market

Ad platforms and retargeting pixels

A/B Testing & Optimization

VWO (Visual Website Optimizer)Mid-Market

Experimentation and conversion optimization

Sponsored

Scripts & Styles

28 Resources

Scripts

Styles

Async

Defer

Top Script Sources

cdnjs.cloudflare.com(6)googletagmanager.com(3)cdn.bizible.com(2)cdn.onesignal.com(2)cdn.jsdelivr.net(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn GitHub

Sponsored

Last analyzed: 20 Feb 2026 at 07:16

Historical Analysis & Change Tracking