W3Techs
advertise here
provided by
Q-Success
Home Technologies Reports API Sites Quality Users Blog Forum FAQ Search

Featured products and servicesadvertise here




lookup another site:
Get our site info tools or use our site info API.

Site Info - Atcoder.jp

Overview of web technologies used by Atcoder.jp.

Website Background

AtCoder:競技プログラミングコンテストを開催する国内最大のサイト
プログラミング初級者から上級者まで楽しめる、競技プログラミングコンテストサイト「AtCoder」。オンラインで毎週開催プログラミングコンテストを開催しています。競技プログラミングを用いて、客観的に自分のスキルを計ることのできるサービスです。
automatic translation provided by Microsoft
AtCoder: The nation's largest site for competitive programming contests
AtCoder is a competition programming contest site that can be enjoyed by beginners and advanced programming beginners. Weekly programming contests are held online. It is a service that allows you to objectively measure your skills using competitive programming.

Description on Homepage

Top 100k among all websites

Popularity rank

Go is a general purpose programming language designed by Google.

Go

JavaScript is a lightweight, object-oriented, cross-platform scripting language, often used within web pages.

JavaScript

jQuery is a JavaScript library that simplifies HTML document traversing, event handling, animating and Ajax interaction. Originally developed by John Resig.

jQuery 1.9.1
94% of sites use a newer version

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Bootstrap

Moment.js is a library to manipulate dates in JavaScript.

Moment.js

KaTeX is a JavaScript library for math typesetting.

KaTeX

Popper is an open source JavaScript library for tooltips and popovers.

Popper 1.14.7
17% of sites use a newer version
used on a subdomain

Bootstrap is an open source HTML, CSS, and JavaScript framework.

Bootstrap

Animate is a CSS library focusing on animations.

Animate
used on a subdomain

Nginx (pronounced as "engine X") is a lightweight open source web server developed by Igor Sysoev.

Nginx

Amazon is a US-based e-commerce and cloud computing provider.

Amazon
hosting info partly based on data from ipinfo.io, see details

Amazon is a US-based e-commerce and cloud computing provider.

Amazon

Amazon CloudFront is a content delivery web service by Amazon.

Amazon CloudFront

Amazon is a US-based e-commerce and cloud computing provider.

Amazon

Gmail is the email service provided by Google.

Gmail

Starfield Technologies is an SSL certificate authority owned by Go Daddy.

Starfield

The CDNJS is a content distribution network, hosting a large number of JavaScript libraries, provided by CloudFlare.

CDNJS
used on a subdomain

The jQuery CDN hosts copies of the jQuery library, provided by MaxCDN.

jQuery CDN
used on a subdomain

Google Analytics is a free service to get detailed statistics about the visitors of a website, provided by Google. This includes the Ads conversion tracking and the Floodlight services.

Google Analytics

The Google Advertising network consists of AdSense, DoubleClick and other services.

Google Ads

The Google Tag Manager is a Google service to support webmasters to manage tags on their websites.

Google Tag Manager

AddToAny is a social bookmarking and sharing service.

AddToAny

External Cascading Style Sheets define style rules in a separate CSS file.

External CSS

Embedded Cascading Style Sheets define a set of style rules in a <style> element within a web page.

Embedded CSS
used on a subdomain

Inline Cascading Style Sheets define style rules directly within an (X)HTML element using the style attribute.

Inline CSS

Session cookies are temporary cookies, which are deleted when the user closes the browser.

Session Cookies

Persistent cookies with an expiration time of up to 1 day.

Cookies expiring in hours
used on a subdomain

Persistent cookies with an expiration time between 1 month and 1 year.

Cookies expiring in months

HttpOnly cookies are used only in the HTTP protocol and not in client side scripts, which may increase security.

HttpOnly Cookies

Secure cookies are used only via an encrypted connections, which may increase security.

Secure Cookies

Gzip (GNU zip) is a file compression algorithm.

Gzip Compression

HTTP/2 is the second major version of the HTTP network protocol.

HTTP/2
used on a subdomain

HTTP Strict Transport Security (HSTS) defines a mechanism enabling web sites to declare themselves accessible only via secure connections.

HTTP Strict Transport Security

The websites redirects visitors to use SSL encryption, e.g. from http://example.com/ to https://example.com/.

Default protocol https

The Open Graph protocol, originally developed by Facebook, is an RDFa-based format that enables any web page to become a rich object in a social graph.

Open Graph

Twitter/X Cards enable automatic attachment of photos, videos and media elements to tweets.

Twitter/X Cards

Generic RDFa (Resource Description Framework in attributes) is RDFa without further specialization.

Generic RDFa

HTML5 is the fifth revision of the HTML standard.

HTML5

UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode, which is backwards compatible with ASCII.

UTF-8

PNG (Portable Network Graphics) is a lossless compression image format, suitable to store graphics with uniformly colored areas, and originally introduced as a free, open-source successor of GIF.

PNG

JPEG (Joint Photographic Experts Group) is a lossy compression method suitable to store photographic images.

JPEG

Scalable Vector Graphics (SVG) is an XML-based vector image format.

SVG

Japan

.jp

Germany
Japan
used on a subdomain
United States
used until recently
Czech Republic
used until recently
Finland
used until recently
Austria
used until recently

Japanese

 

 

Share this page

About Us Disclaimer Terms of Use Privacy Policy Advertising Contact
W3Techs on   LinkedIn LinkedIn Mastodon Mastodon Bluesky Bluesky
Copyright © 2009-2026 Q-Success