erlang.org

Index - Erlang/OTP

Last scanned Jul 26, 2026, 5:18 AM

89

Overall score

Great

Summary

The official home of the Erlang Programming Language. This website uses Bootstrap hosted on AWS behind Netlify CDN. SEO is good (85/100) and accessibility is excellent (100/100). Security scores good (75/100) and performance excellent (100/100). Top issue: Missing canonical link.

The official home of the Erlang Programming Language

United States

Hosted on AWS

Top issues to fix

6 issues found · 2 high priority

TLS certificate expires in 14 days
Security
Renew now (or enable auto-renewal) — an expired certificate blocks visitors with a full-page browser warning.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.
1 broken link on the page
SEO
Fix or remove broken links — they waste crawl budget and erode user trust.

85

SEO

3 issue(s) found

100

Performance

233 ms

75

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

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

The official home of the Erlang Programming Language

Meta tags

Title: Index - Erlang/OTP
Description: The official home of the Erlang Programming Language
Canonical
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1
Robots meta
Manifest

Technologies

Detected frameworks, languages, and tools.

Hosting & CDN

Hosting provider: AWS
CDN provider: Netlify
IP address: 52.74.6.109
ASN: AS16509 (AMAZON-02 - Amazon.com, Inc., US)

DNS records

Type	Value
A	52.74.6.109 13.215.239.219
AAAA	2406:da18:b3d:e201::258 2406:da18:b3d:e201::259
MX	—
TXT	—
NS	—
CAA	—
CNAME	erlang-org.netlify.app
IPv6 support	Yes

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: www.erlang.org
Valid from: May 11, 2026
Valid to: Aug 9, 2026
Days until expiry: 14
SAN domains: beta.erlang.org, blog.erlang.org, bugs.erlang.org, www.erlang.org

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyEnabled
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 4 · H3 3

Links

15 internal · 2 external · 1 broken

Images

2 total · 0 missing alt

Scripts / Styles

5 scripts · 1 stylesheets

JS / CSS size

139 KB · 57.2 KB

Page size

26.5 KB

Robots.txt & Sitemap

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

SEO issues

Missing canonical link
robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://erlang.org
Final URL: https://www.erlang.org/
HTTP status: 200
HTTP version: HTTP/2
Response time: 233 ms
HTML size: 26.5 KB
Redirect chain: https://erlang.org → https://www.erlang.org/

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Frequently asked questions

What technology does erlang.org use?: erlang.org is built with Bootstrap.
Is erlang.org secure (HTTPS)?: Yes. erlang.org uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Aug 9, 2026.
Who hosts erlang.org?: erlang.org is hosted on AWS, behind Netlify CDN.
What is erlang.org's SEO score?: erlang.org scored 85/100 for SEO in the latest analysis (great).
What is erlang.org's overall website score?: erlang.org has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.