Ahrefs Stack

Ahrefs.com is built with the following tech stack:

Document Encoding

UTF-8

UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.

Document Standards

Meta Description

The description attribute provides a concise explanation of the page content.

Open Graph Protocol

The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook

Twitter Cards

Twitter cards make it possible for you to attach media experiences to Tweets that link to your content.

Canonical Content Tag

Public specification of a preferred URL for a page allows search engines to understand the original location for content.

HREF Lang

Contains language specific links.

Web App Manifest

Defines the attributes of a web app in a simple JSON file. It describes how the web app should appear on the users system and how it should launch.

Javascript Defer

The defer attribute gives a hint to the browser that the script does not create any content so the browser can optionally defer interpreting the script. This can improve performance by delaying execution of scripts until after the body content is parsed and rendered.

Javascript

JavaScript is a scripting language most often used for client-side web development.

Referrer Policy

Requests made from a document, and for navigations away from that document are associated with a Referrer header. This policy determines in the browser should send a referrer or not.

WAI-ARIA

A way to make Web content and Web applications more accessible to people with disabilities. It especially helps with dynamic content and advanced user interface controls developed with Ajax, HTML, JavaScript, and related technologies.

HTML5 DocType

The DOCTYPE is a required preamble for HTML5 websites.

HTML 5 Specific Tags

This page contains tags that are specific to an HTML 5 implementation.

Content Security Policy

Content Security Policy is a computer security concept, to prevent cross-site scripting XSS attacks.

Content Type Options

Used to disable MIME-sniffing for a particular HTTP response.

Strict Transport Security

The HTTP Strict-Transport-Security (HSTS) header instructs the browser to only use https.

Mobile

Viewport Meta

This page uses the viewport meta tag which means the content may be optimized for mobile content.

Apple Mobile Web Clips Icon

This page contains an icon for iPhone, iPad and iTouch devices.

Language

Germany HREF LANG

This webpage has alternate versions available in Germany via the use of the hreflang tag.

United States HREF LANG

This webpage has alternate versions available in United States via the use of the hreflang tag.

Spain HREF LANG

This webpage has alternate versions available in Spain via the use of the hreflang tag.

France HREF LANG

This webpage has alternate versions available in France via the use of the hreflang tag.

Italy HREF LANG

This webpage has alternate versions available in Italy via the use of the hreflang tag.

Japan HREF LANG

This webpage has alternate versions available in Japan via the use of the hreflang tag.

Netherlands HREF LANG

This webpage has alternate versions available in Netherlands via the use of the hreflang tag.

Poland HREF LANG

This webpage has alternate versions available in Poland via the use of the hreflang tag.

Portugal HREF LANG

This webpage has alternate versions available in Portugal via the use of the hreflang tag.

Russia HREF LANG

This webpage has alternate versions available in Russia via the use of the hreflang tag.

Sweden HREF LANG

This webpage has alternate versions available in Sweden via the use of the hreflang tag.

Turkey HREF LANG

This webpage has alternate versions available in Turkey via the use of the hreflang tag.

Chinese HREF LANG

This webpage has alternate versions available in Chinese via the use of the hreflang tag.

SSL Certificates

HSTS

Forces browsers to only communicate with the site using HTTPS.