Web Technologies Used by duolingo.com

Google Tag Manager is a free tool from Google that enables users to easily add, update, and manage website tags. Tags are snippets of code that allow websites to track activity, such as page visits and clicks, in order to better understand user behavior. Google Tag Manager makes it easy to quickly and easily add, update, and manage website tags without having to manually update code. It also helps to ensure that tags are firing correctly and accurately tracking user activity.

Envoy is an open source edge and service proxy, designed for cloud-native applications.

Amazon Web Services is a subsidiary of Amazon that provides on-demand cloud computing platforms to individuals, companies, and governments, on a metered pay-as-you-go basis.

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.

Amazon Application Load Balancer (ALB) distributes incoming application traffic to increase availability and support content-based routing.

Lodash is a JavaScript library which provides utility functions for common programming tasks using the functional programming paradigm.

Howler.js is an audio library with support for the Web Audio API and a fallback mechanism for HTML5 Audio.

core-js is a modular standard library for JavaScript, with polyfills for cutting-edge ECMAScript features.

React is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies. React can be used as a base in the development of single-page or mobile applications, as it is optimal for fetching rapidly changing data that needs to be recorded.

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

OneTrust is a cloud-based data privacy management compliance platform.

reCAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human and, at the same time, assist in the digitization of books or improve machine learning.