Phoenix vs Rails
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A web framework for Elixir for building web apps and APIs, from prototype to production.
Open source · MIT
A Ruby web framework for building database-backed web apps using the MVC pattern.
The short answer
Choose Phoenix if you need…
- Developers who already use or want to learn Elixir
- Teams building web applications or API servers in Elixir
- Projects that need realtime features, based on the repository topics
- Developers looking for an MIT-licensed, community-supported framework
Choose Rails if you need…
- Developers building database-backed web applications in Ruby
- Teams who want a full set of built-in components instead of assembling many libraries
- Developers who want to follow a conventional MVC structure
- Students learning MVC web development with Ruby
Side-by-side
| Phoenix | Rails | |
|---|---|---|
| Type | Framework | Framework |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 23.2k | 58.8k |
| Setup difficulty | Intermediate | Intermediate |
| How you get it | See the README | Install with a package manager |
| Main language | Elixir | Ruby |
| Last code update | 4 days ago | 4 days ago |
What each one is
Phoenix
Phoenix is a web framework written in Elixir, a programming language that runs on the Erlang virtual machine. It provides the building blocks for web applications and APIs, and its README describes it as offering peace of mind from prototype to production. The README is short and points to the official site and hexdocs for the detailed documentation.
Rails
Ruby on Rails is a web application framework that bundles what's needed to build database-backed websites and apps, organized around the Model-View-Controller pattern. Models hold data and business logic, views produce the HTML or other output, and controllers handle incoming requests. It also includes libraries for email, background jobs, WebSockets, file storage and rich text.
Best for
Phoenix
- Developers who already use or want to learn Elixir
- Teams building web applications or API servers in Elixir
- Projects that need realtime features, based on the repository topics
- Developers looking for an MIT-licensed, community-supported framework
Rails
- Developers building database-backed web applications in Ruby
- Teams who want a full set of built-in components instead of assembling many libraries
- Developers who want to follow a conventional MVC structure
- Students learning MVC web development with Ruby
Strengths
Phoenix
- Released under the permissive MIT license
- Active project with recent updates and a large star count
- Documentation is published on hexdocs and the official site
Rails
- Includes many components (database access, email, jobs, storage, WebSockets) in one framework
- Each core part such as Active Record or Action Pack can also be used on its own
- Released under the permissive MIT License
Not ideal for
Phoenix
- People who do not want to learn Elixir, since the framework requires it
- Beginners looking for a simple no-code or low-code tool
- Projects that need a language with a larger ecosystem of ready-made libraries, since the README does not compare ecosystem size
Rails
- Projects that must be written in a language other than Ruby, since Rails is Ruby-only
- Very small static sites, where a simpler tool is likely enough (the README does not compare sizes, so this is a general judgment)
- People who need a non-MVC architecture as their primary design
Trade-offs
Phoenix
- Requires knowledge of Elixir and the Erlang virtual machine
- The README is brief and defers most detail to external documentation
- Building from source involves several Mix steps that assume familiarity with the Elixir toolchain
Rails
- Requires understanding of Ruby and the MVC pattern before productive use
- The README is truncated here, so detailed configuration and deployment guidance is not covered in this entry
Getting started
Phoenix
Clone the repository to build from source
git clone https://github.com/phoenixframework/phoenixFetch dependencies for building Phoenix
mix deps.getRails
Install Rails
gem install railsCreate a new app
rails new myappFrequently asked questions
What is the difference between Phoenix and Rails?
Phoenix: A web framework for Elixir for building web apps and APIs, from prototype to production. Rails: A Ruby web framework for building database-backed web apps using the MVC pattern. Phoenix suits developers who already use or want to learn elixir, while Rails suits developers building database-backed web applications in ruby.
Are Phoenix and Rails free?
Phoenix: Free and open source. Rails: Free and open source.
Is Phoenix or Rails more popular?
Rails has more GitHub stars (58.8k) than Phoenix (23.2k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to Phoenix and Rails?
Other options people compare them with include Sanic, Sinatra, Aurelia.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.