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

vishay.com

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

Export

vishay.com

Mobile

Sponsored

Hosting Provider

Vishay Intertechnology, Inc.

IP Address

198.24.10.102

Server Location

🇺🇸 Malvern, United States

ASN

AS62541

Organization

Vishay Intertechnology, Inc.

Server

Nginx

Nameservers

ns1.vishay.com.ns4.vishay.com.ns3.vishay.com.ns2.vishay.com.

Performance

Page Speed

1.4 MB

103 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚡ SSG

Frontend

Framework

Next.js

CMS

HubSpot CMS

Infrastructure

Hosting

Vishay Intertechnology, Inc.

Technology Stack

10 Technologies Detected

Libraries

Analytics

Meta Frameworks

UI Components

CSS Frameworks

Tag Managers

Marketing

Web Servers

SEO Analysis

D58/100

vishay.comvishay.com

Vishay Intertechnology: Passives & Discrete Semiconductors

Vishay electronic component solutions - MOSFETs, ICs, Diodes & Rectifiers, Optoelectronics, Resistors, Sensors, Inductors, Custom Magnetics, and Capacitors

Title Length58 chars

Recommended: 50-60 chars

Description Length155 chars

Recommended: 120-160 chars

Issues (0)

5 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

556 rules

Sitemap reference found

Sponsored

Security Score

46%Poor

Interactive

HTTPS

No WAF

98d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

30.05.2025

Valid Until

29.05.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.vishay.comwww.aztronic.jpwww.aztronic.inwww.aztronic.com.cnwww.aztronic.cnwww.angstrohm.comvpn.vishay.comvishay.com+12 more

SHA-256 Fingerprint

63:5E:DE:95:51:1B:FE:B4:79:6E:BD:32:79:56:19:DF:F7:3D:3E:72...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

access-control-allow-credentials

true

access-control-allow-headers

access-control-allow-methods

POST, GET, OPTIONS

access-control-allow-origin

https://vishay.transim.com

content-encoding

📦 Gzip(gzip)

content-type

text/html

Good Warning Issue

Email Infrastructure

Microsoft 365

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

vishay-com.mail.protection.outlook.com

Domain Information

vishay.com

Domain Age

30y 5m

Created

10.09.1995

Expires

09.09.2026

Last Updated

05.09.2025

Registrar

CSC Corporate Domains, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner

Cookiebot

GDPR Indicators

Cookie consent banner detected

CMP: Cookiebot

Typography & Readability

Arial

70/100

Readability

/30

30/40

48px · LH --

Hierarchy

/20

15/25

0.94x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

Arial

Sans45px

Body Font

Arial

Sans48px

Contrast Ratio

Reading Comfort

~98 CPL

Needs attention

45px

48px

✅ Excellent readability: 48px body text is ideal for all devices.

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

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

✅ Consistent design: Single font family with weight variations is a modern best practice.

⚠️ Wide lines: ~98 chars/line. Consider max-width for better reading flow.

Business & Marketing Stack

5 Tools Detected

Enterprise

CRM Systems

HubSpotMid-Market

Customer Relationship Management platforms

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

OneTrustEnterprise

CookiebotMid-Market

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

30 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)cdn.cookielaw.org(2)js.usemessages.com(1)js.hs-analytics.net(1)js.hs-banner.com(1)

Website Identity

Facebook LinkedIn YouTube

Sponsored

Last analyzed: 20 Feb 2026 at 03:45

Historical Analysis & Change Tracking