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

do.co

https://do.co· First analyzed 19 Feb 2026· Updated 19 Feb 2026

Export

do.co

Sponsored

Hosting Provider

Google Cloud Platform

cloud.google.com

IP Address

67.199.248.13

Server Location

🇺🇸 New York, United States

ASN

AS396982

Organization

Bitly Inc

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

walt.ns.cloudflare.com.kim.ns.cloudflare.com.

Performance

Page Speed

2.6 MB

102 requests

Image Optimization

Lazy LoadWebPResponsive

0–49

50–89

90–100

Architecture Stack

JAMstack

⚡ SSG

Decoupled

Frontend

Framework

Next.js

API

Data Source

Headless CMS

Strapi

Infrastructure

Hosting

Google Cloud Platform

CDN

Cloudflare

Detected API Sources

https://www.digitalocean.com/a...

Technology Stack

8 Technologies Detected

Analytics

Meta Frameworks

Other

CSS Frameworks

Tag Managers

CDN

SEO Analysis

B76/100

do.codo.co

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Title Length63 chars

Recommended: 50-60 chars

Description Length148 chars

Recommended: 120-160 chars

Issues (0)

3 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

36%Critical

Interactive

HTTPS

WAF

57d

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

Valid From

18.01.2026

Valid Until

18.04.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

digitalocean.com*.digitalocean.com

SHA-256 Fingerprint

33:30:DA:E0:EB:32:9F:2F:FE:32:E9:B7:A4:F5:22:36:45:B8:FC:18...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

age

261

cache-control

⚪ Custom(s-maxage=1800, stale-while-revalidate=31534200)

cf-cache-status

HIT

cf-ray🇩🇪 Frankfurt

9d077aaebb9707ca-FRA

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

Good Warning Issue

Email Infrastructure

Google Workspace

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

aspmx.l.google.com

alt2.aspmx.l.google.com

aspmx3.googlemail.com

alt1.aspmx.l.google.com

+1 more

Domain Information

do.co

DNSSEC

Not Enabled

Privacy & Compliance

TrustArc

Cookie Consent Banner

TrustArc

GDPR Indicators

Cookie consent banner detected

CMP: TrustArc

Data Protection Officer mentioned

Typography & Readability

Epilogue + Inter

78/100

Readability

/30

32/40

14px · LH 1.43

Hierarchy

/20

25/25

3.43x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Epilogue

Sans48px

Body Font

Inter

Sans14px

Contrast Ratio

Reading Comfort

~38 CPL

Needs attention

48px

18px

20px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.43 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 3.4x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

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

✅ Protected text on images: Using gradient for readability.

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Advanced

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

AmplitudeMid-Market

User behavior and product analytics

Privacy & Cookies

TrustArcEnterprise

Cookie consent and privacy compliance tools

Sponsored

Scripts & Styles

21 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(13)googletagmanager.com(2)consent.trustarc.com(2)segment.digitalocean.com(1)cdn.amplitude.com(1)

Website Identity

Facebook X (Twitter)Instagram LinkedIn GitHub Discord

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Last analyzed: 19 Feb 2026 at 17:28

Historical Analysis & Change Tracking