Phoenix Framework

Phoenix is a web development framework for the Elixir programming language, created by Chris McCord in 2014. It is designed to build highly scalable, real-time, and fault-tolerant web applications by leveraging the unique capabilities of the Erlang VM (BEAM), which was built by Ericsson to power telecommunications systems with 99.9999999 percent uptime (nine nines). Phoenix brings the developer ergonomics and productivity of modern web frameworks (comparable to Ruby on Rails, from which it draws significant inspiration) to the Elixir language, combining rapid development with the legendary reliability and concurrency of the Erlang runtime. Key features include: LiveView (Phoenix's flagship feature that eliminates the need for JavaScript SPAs by enabling rich, real-time, interactive user interfaces using server-rendered HTML and WebSockets — developers write Elixir template code and Phoenix handles the real-time diffing and DOM updates automatically, dramatically reducing frontend complexity), channels (real-time communication via WebSockets for features like chat, notifications, and live updates, powered by the Erlang VM's ability to handle millions of concurrent connections), Ecto (a database wrapper and ORM that provides a composable query DSL, schema definitions, migrations, and changesets for validation), Plug (a specification for composable middleware between the web server and application logic, similar to Rack in Ruby or WSGI in Python), presence (tracking which users are online in real-time across distributed nodes), built-in testing support (with ExUnit integration), a powerful router with pipeline-based request processing, HTML templating via HEEx (HTML + Embedded Elixir), internationalization support, and Phoenix PubSub for distributed pub-sub messaging. As of 2026, Phoenix has over 22,000 stars.