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kotl.in

Kotlin Programming Language

Last scanned Aug 6, 2026, 5:00 PM · 8 views

83

Overall score

Great

Summary

Kotlin is a concise and multiplatform programming language by JetBrains. This website uses Next.js behind CloudFront CDN. SEO is good (75/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance good (85/100). Top issue: Multiple H1 headings found.

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

Top issues to fix

7 issues found · 2 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Multiple H1 headings found

    SEO

    Keep a single H1 per page and demote the others to H2/H3.

  • No structured data (JSON-LD) found

    SEO

    Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+1 more issue — details in the sections below.

75

SEO

4 issue(s) found

85

Performance

580 ms

75

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

-3 overall since Jul 26, 2026

Overall
83
SEO
75
Security
75
Performance
85
Accessibility
100

Organization

Company details published in this site's own structured data.

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

YouTubeX (Twitter)YouTube

Meta tags

Title
Kotlin Programming Language
Description
Kotlin is a concise and multiplatform programming language by JetBrains. Enjoy coding and build backend, mobile, web, and desktop applications efficiently.
Canonical
https://kotlinlang.org/
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
Kotlin Programming Language
og:description
Kotlin is a concise and multiplatform programming language by JetBrains. Enjoy coding and build backend, mobile, web, and desktop applications efficiently.
og:type
website
og:url
https://kotlinlang.org/

Twitter Card

twitter:card
summary_large_image
twitter:title
Kotlin Programming Language
twitter:description
Kotlin is a concise and multiplatform programming language by JetBrains. Enjoy coding and build backend, mobile, web, and desktop applications efficiently.

Technologies

Detected frameworks, languages, and tools.

Next.jsGoogle AnalyticsMeta PixelTikTok Pixel

Hosting & CDN

Hosting provider
—
CDN provider
CloudFront
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Amazon
Subject
kotlinlang.org
Valid from
Aug 6, 2026
Valid to
Feb 19, 2027
Days until expiry
197
SAN domains
kotlinlang.org, www.kotlinlang.org, kotlinlang.prod.kotlin-aws.intellij.net, www.kotlinlang.prod.kotlin-aws.intellij.net

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsEnabled
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyEnabled
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 5 · H2 8 · H3 16

Links

34 internal · 36 external · 0 broken

Images

51 total · 2 missing alt

Scripts / Styles

55 scripts · 7 stylesheets

JS / CSS size

1.2 MB · 87.0 KB

Page size

245 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Multiple H1 headings found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

No accessibility issues detected.

Scan details

Requested URL
https://kotl.in
Final URL
https://kotlinlang.org
HTTP status
200
HTTP version
HTTP/2
Response time
575 ms
HTML size
245 KB
Redirect chain
https://kotl.in → https://kotlinlang.org

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Frequently asked questions

What technology does kotl.in use?
kotl.in is built with Next.js, Google Analytics, Meta Pixel, TikTok Pixel.
Is kotl.in secure (HTTPS)?
Yes. kotl.in uses TLS 1.3 with a certificate issued by Amazon, valid until Feb 19, 2027.
Who hosts kotl.in?
Hosting provider information for kotl.in is not available yet.
What is kotl.in's SEO score?
kotl.in scored 75/100 for SEO in the latest analysis (fair).
What is kotl.in's overall website score?
kotl.in has an overall SiteGraph score of 83/100, combining SEO, performance, security, and accessibility.
Has kotl.in's score changed over time?
kotl.in's overall score has declined by 3 points (from 86 to 83) since Jul 26, 2026.