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

umblr.com

https://umblr.com· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

umblr.com

Mobile

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Hosting Provider

TUMBLR, INC

IP Address

74.114.154.21

Server Location

🇺🇸 Ashburn, United States

ASN

AS2635

Organization

TUMBLR, INC

Server

Nginx

Nameservers

ns1.tumblr.com.ns3.tumblr.com.ns4.tumblr.com.ns2.tumblr.com.

Performance

Page Speed

115 KB

13 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

WordPress

cms

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

3 Technologies Detected

Advertising

Google AdSense

Web Servers

Nginx

Security

reCAPTCHA

SEO Analysis

F35/100

umblr.comumblr.com

Tumblr

Tumblr. Pure effervescent enrichment. Old internet energy. Home of the Reblogs. All the art you never knew you needed. All the fandoms you could wish for. En...

Description truncated.

Title Length6 chars

Recommended: 50-60 chars

Description Length258 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

5 issues found

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Crawlability

Sitemap

robots.txt

127 rules

Sponsored

A+

Security Score

96%Excellent

Static / Informational

HTTPS

No WAF

35d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Sectigo Limited

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-256

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

25.02.2025

Valid Until

26.03.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.tumblr.comtumblr.com

SHA-256 Fingerprint

94:0D:5B:51:16:8A:17:28:49:1A:83:D9:4E:7D:DD:27:B3:30:C2:8A...

Upgrade to view header details

HTTP Headers

Developer Console

alt-svc

h3=":443"; ma=86400

cache-control

🟡 0s(public, max-age=0, s-maxage=60, must-revalidate)

content-encoding

⚡ Brotli(br)

content-security-policy

script-src 'self' 'unsafe-eval' 'unsafe-inline' https://www....

content-type

text/html; charset=utf-8

date

Thu, 19 Feb 2026 17:52:07 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

Domain Information

umblr.com

Domain Age

17y 2m

Created

06.12.2008

Expires

06.12.2027

Last Updated

04.11.2025

Registrar

MarkMonitor Inc.

DNSSEC

Not Enabled

Typography & Readability

Favorit + Helvetica Neue

61/100

Readability

/30

25/40

16px · LH 1.00

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

1 font

Heading Font

Favorit

Body Font

Helvetica Neue

Sans16px

Contrast Ratio

Reading Comfort

Mixed Pairing

left aligned

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

⚠️ Tight line spacing (1.00). Consider 1.4-1.6 for better readability.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Clean layout: Consistent left alignment throughout.

Buy on MyFonts

Business & Marketing Stack

2 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

Quantcast ChoiceMid-Market

Cookie consent and privacy compliance tools

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Scripts & Styles

10 Resources

Scripts

Styles

Async

Defer

Top Script Sources

assets.tumblr.com(6)s0.wp.com(1)

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Last analyzed: 19 Feb 2026 at 17:52

Historical Analysis & Change Tracking