Web Technologies Used by codepen.io

Ruby on Rails, or Rails, is a server-side web application framework written in Ruby under the MIT License. Rails is a model–view–controller framework, providing default structures for a database, a web service, and web pages.

Ruby is an interpreted, high-level, general-purpose programming language.

PayPal Holdings, Inc. is an American company operating a worldwide online payments system that supports online money transfers and serves as an electronic alternative to traditional paper methods like checks and money orders.

Webpack is an open-source JavaScript module bundler, primarily for JavaScript, but it can transform front-end assets like HTML, CSS, and images if the corresponding plugins are included. Webpack takes modules with dependencies and generates static assets representing those modules.

Open-source error tracking that helps developers monitor and fix crashes in real time.

Cloudflare is a company that provides content delivery network services, DDoS mitigation, Internet security and distributed domain name server services. Cloudflare's services sit between the visitor and the Cloudflare user's hosting provider, acting as a reverse proxy for websites.

Cloudflare bot management solution identifies and mitigates automated traffic to protect websites from bad bots.

BuySellAds is a marketplace for Publishers and for Advertisers to buy and sell ads.

Carbon Ads is an ad tech company, that connects advertisers to users through targeted verticals called Circles.