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

kotlinlang.org

https://kotlinlang.org· First analyzed 17 Feb 2026· Updated 17 Feb 2026

Export

kotlinlang.org

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.174.113.93

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

AmazonS3

CDN

CloudFront

Nameservers

ns-1287.awsdns-32.org.ns-163.awsdns-20.com.ns-1638.awsdns-12.co.uk.ns-953.awsdns-55.net.

Performance

Page Speed

1.3 MB

62 requests

Image Optimization

Lazy LoadResponsive

0–49

50–89

90–100

Architecture Stack

Hybrid

⚡ SSG

Frontend

Framework

Next.js

CMS

Medium

Infrastructure

Hosting

Amazon Web Services (AWS)

CDN

CloudFront

Technology Stack

7 Technologies Detected

Analytics

Meta Frameworks

CSS Frameworks

Fonts

Tag Managers

Other

SEO Analysis

B70/100

kotlinlang.orgkotlinlang.org

Kotlin Programming Language

Kotlin is a concise and multiplatform programming language by JetBrains. Enjoy coding and build server-side, mobile, web, and desktop applications efficiently.

Title Length27 chars

Recommended: 50-60 chars

Description Length159 chars

Recommended: 120-160 chars

Issues (0)

4 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

440 URLs

robots.txt

3 rules

Sitemap reference found

Allows all crawlers

Sponsored

Security Score

41%Poor

Interactive

HTTPS

WAF

229d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

06.09.2025

Valid Until

04.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (4)

kotlinlang.orgwww.kotlinlang.orgkotlinlang.prod.kotlin-aws.intellij.netwww.kotlinlang.prod.kotlin-aws.intellij.net

SHA-256 Fingerprint

DD:E9:EB:E4:03:91:3E:80:06:E1:E9:9C:2E:2F:12:B6:BA:CF:E1:B4...

Top Recommendations

Security recommendation preview

Upgrade to view recommendations

Upgrade to view header details

HTTP Headers

Developer Console

content-encoding

📦 Gzip(gzip)

content-type

text/html; charset=utf-8

date

Tue, 17 Feb 2026 04:34:15 GMT

etag

W/"39002e8fcbda01c6393a2ca612e4846b"

last-modified

Mon, 16 Feb 2026 17:34:01 GMT

referrer-policy

strict-origin-when-cross-origin

Good Warning Issue

Email Infrastructure

Google Workspace

Score

100

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt1.aspmx.l.google.com

alt4.aspmx.l.google.com

aspmx.l.google.com

alt2.aspmx.l.google.com

+1 more

Domain Information

kotlinlang.org

Domain Age

12y 4m

Created

30.09.2013

Expires

30.09.2026

Last Updated

22.09.2025

Registrar

Squarespace Domains II LLC

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

Typography & Readability

JetBrains Sans

81/100

Readability

/30

40/40

16px · LH 1.50

Hierarchy

/20

25/25

4.5x ratio

WCAG

/25

15/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

JetBrains Sans

Sans72px

Body Font

JetBrains Sans

Sans16px

Contrast Ratio

Reading Comfort

~87 CPL

Needs attention

72px

35px

16px

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

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 4.5x larger than body text.

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

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

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

Buy on MyFonts

Business & Marketing Stack

4 Tools Detected

Enterprise

Behavior Analytics

Google Tag ManagerFree

Google AnalyticsFree

User behavior and product analytics

Advertising

Microsoft AdsEnterprise

Ad platforms and retargeting pixels

A/B Testing & Optimization

OptimizelyEnterprise

Experimentation and conversion optimization

Sponsored

Scripts & Styles

27 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(12)googletagmanager.com(4)cdn.optimizely.com(2)cdn.cookiehub.eu(1)cdn3.optimizely.com(1)

Website Identity

X (Twitter)YouTube GitHub Reddit Medium Bluesky

Sponsored

Last analyzed: 17 Feb 2026 at 04:34

Historical Analysis & Change Tracking