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Duolingo Stack
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Duolingo.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.
Mobile
Viewport Meta
This page uses the viewport meta tag which means the content may be optimized for mobile content.
Mobile Non Scaleable Content
This content is formatted for mobile devices, it does not allow the content to be scaled.
Apple Mobile Web App Capable
Launches a web application for Safari on iOS in full-screen mode to look like a native application.
IPhone / Mobile Compatible
The website contains code that allows the page to support IPhone / Mobile Content.
Apple Mobile Web Clips Icon
This page contains an icon for iPhone, iPad and iTouch devices.
Document Standards
Meta Robot
This page contains a meta robots tag which tells search engines and robots to index or not index the page.
Twitter Cards
Twitter cards make it possible for you to attach media experiences to Tweets that link to your 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
Meta Keywords
Meta tag containing keywords related to the page.
Meta Description
The description attribute provides a concise explanation of the page content.
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.
HREF Lang
Contains language specific links.
Canonical Content Tag
Public specification of a preferred URL for a page allows search engines to understand the original location for content.
Cascading Style Sheets
Cascading Style Sheets (CSS) is a stylesheet language used to describe the presentation of a document written in a markup language. Its most common application is to style web pages written in HTML
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.
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 Type Options
Used to disable MIME-sniffing for a particular HTTP response.
Language
Saudi Arabia HREF LANG
This webpage has alternate versions available in Saudi Arabia via the use of the hreflang tag.
Brunei Darussalam HREF LANG
This webpage has alternate versions available in Brunei Darussalam via the use of the hreflang tag.
Costa Rica HREF LANG
This webpage has alternate versions available in Costa Rica via the use of the hreflang tag.
Germany HREF LANG
This webpage has alternate versions available in Germany via the use of the hreflang tag.
Greek HREF LANG
This webpage has alternate versions available in Greek 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.
Hindi HREF LANG
This webpage has alternate versions available in Hindi via the use of the hreflang tag.
Hungarian HREF LANG
This webpage has alternate versions available in Hungarian via the use of the hreflang tag.
Indonesian HREF LANG
This webpage has alternate versions available in Indonesian 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.
Korea HREF LANG
This webpage has alternate versions available in Korea 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.
Romanian HREF LANG
This webpage has alternate versions available in Romanian 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.
Thai HREF LANG
This webpage has alternate versions available in Thai 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.
Ukrainian HREF LANG
This webpage has alternate versions available in Ukrainian via the use of the hreflang tag.
Vietnamese HREF LANG
This webpage has alternate versions available in Vietnamese 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.