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

fiserv.com

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

Export

fiserv.com

Mobile

Sponsored

Hosting Provider

Fastly, Inc.

IP Address

151.101.195.10

Server Location

🇨🇦 Montreal, Canada

ASN

AS54113

Organization

Fastly, Inc.

CDN

Fastly

Nameservers

ns2.p201.dns.oraclecloud.net.dns4.p07.nsone.net.ns1.p201.dns.oraclecloud.net.dns2.p07.nsone.net.

Performance

Page Speed

3.1 MB

61 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Technology Stack

6 Technologies Detected

Analytics

Google Analytics

Facebook Pixel

Advertising

Google Ads Twitter Ads

Libraries

jQuery

CSS Frameworks

Tailwind CSS

SEO Analysis

B76/100

fiserv.comfiserv.com

Financial Services Technology, Mobile Banking, Payments | Fiserv

Fiserv is a global fintech and payments company with solutions for banking, global commerce, merchant acquiring, billing and payments, and point-of-sale.

Title Length64 chars

Recommended: 50-60 chars

Description Length153 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

700 URLs

robots.txt

4 rules

Sitemap reference found

Sponsored

Security Score

76%Good

Interactive

HTTPS

No WAF

207d

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

19.08.2025

Valid Until

15.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

www.fiserv.combillmatrix.combillmatrix.netcardvalet.comcheckfreepay.comfiserv.comstage.billmatrix.comstage.fiserv.com+12 more

SHA-256 Fingerprint

B6:A2:03:8C:12:D6:DA:9A:40:72:B6:60:30:50:75:FF:F9:DA:4F:B8...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges

bytes

access-control-allow-credentials

true

access-control-allow-headers

Origin, Accept, Authorization, X-Requested-With, Content-Typ...

access-control-allow-methods

GET, OPTIONS

access-control-allow-origin

https://fsbi.fiservapps.com

access-control-max-age

86400

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (2)

mxa-00265f01.gslb.pphosted.com

mxb-00265f01.gslb.pphosted.com

Domain Information

fiserv.com

Domain Age

32y 3m

Created

02.11.1993

Expires

01.11.2026

Last Updated

28.10.2025

Registrar

CSC Corporate Domains, Inc.

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

Typography & Readability

Univers Fiserv Light + Univers Fiserv Regular

70/100

Readability

/30

32/40

20px · LH 1.25

Hierarchy

/20

18/25

2.4x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

10/20

3 fonts

Heading Font

Univers Fiserv Light

Sans48px

Body Font

Univers Fiserv Regular

Sans20px

Contrast Ratio

Reading Comfort

~43 CPL

Needs attention

48px

24px

20px

✅ Excellent readability: 20px body text is ideal for all devices.

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

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

⚠️ Cramped layout: 10 elements lack adequate spacing.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

Google AnalyticsFree

Google Tag ManagerFree

User behavior and product analytics

Advertising

Facebook PixelMid-Market

Twitter/X AdsMid-Market

Ad platforms and retargeting pixels

Social Media

Twitter/X WidgetsFree

Social widgets and sharing tools

Sponsored

Scripts & Styles

22 Resources

Scripts

Styles

Async

Defer

Top Script Sources

c.evidon.com(6)assets.adobedtm.com(4)googletagmanager.com(3)local(3)connect.facebook.net(2)

Website Identity

Facebook X (Twitter)Instagram LinkedIn

Sponsored

Last analyzed: 20 Feb 2026 at 08:37

Historical Analysis & Change Tracking