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

palletsprojects.com

https://palletsprojects.com· First analyzed 14 Feb 2026· Updated 14 Feb 2026

Export

palletsprojects.com

Mobile

Sponsored

Hosting Provider

Fly.io

fly.io

IP Address

66.241.125.248

Server Location

🇫🇷 Paris, France

ASN

AS40509

Organization

Fly.io, Inc

Server

Fly/fa1396eb3 (2026-02-10)

CDN

Cloudflare

WAF

Cloudflare

Nameservers

kobe.ns.cloudflare.com.ariadne.ns.cloudflare.com.

Performance

Page Speed

30 KB

10 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Fly.io

CDN

Cloudflare

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Platforms

Fly.io

SEO Analysis

F23/100

palletsprojects.compalletsprojects.com

Pallets

No description available for this page.

Title Length7 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description - important for click-through rates
• Missing H1 tag - every page should have one H1
• Many images missing alt text (8/8)

8 issues found

Upgrade to view details

Crawlability

Sitemap

robots.txt

28 rules

Sponsored

Security Score

71%Good

Static / Informational

HTTPS

No WAF

85d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.02.2026

Valid Until

10.05.2026

Subject Alternative Names (1)

palletsprojects.com

SHA-256 Fingerprint

9D:EC:5C:3B:C5:20:87:43:56:6F:AC:8F:0B:D5:A5:0D:B9:04:5F:14...

Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

zstd

content-type

text/html; charset=utf-8

date

Sat, 14 Feb 2026 02:01:43 GMT

fly-request-id

01KHCY3SWNCJT5MKG4X9YBHGGS-fra

server

Fly/fa1396eb3 (2026-02-10)

via

2 fly.io, 2 fly.io

Good Warning Issue

Email Infrastructure

Fastmail

Score

SPF

DKIM

DMARC

MX Records (2)

in2-smtp.messagingengine.com

in1-smtp.messagingengine.com

Domain Information

palletsprojects.com

Domain Age

9y 10m

Created

03.04.2016

Expires

03.04.2031

Last Updated

27.08.2025

Registrar

Gandi SAS

DNSSEC

Not Enabled

Typography & Readability

system-ui

83/100

Readability

/30

40/40

21px · LH 1.50

Hierarchy

/20

8/25

WCAG

/25

15/15

Contrast: undefined

Performance

/25

20/20

System fonts

Heading Font

system-ui

Body Font

system-ui

Sans21px

Contrast Ratio

Reading Comfort

~39 CPL

Needs attention

21px

✅ Excellent readability: 21px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

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

✅ Clean layout: Consistent left alignment throughout.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

GitHub

Sponsored

Last analyzed: 14 Feb 2026 at 02:01

Historical Analysis & Change Tracking