Software Alternatives, Accelerators & Startups

Phoenix Framework VS FastAPI

Compare Phoenix Framework VS FastAPI and see what are their differences

Phoenix Framework logo Phoenix Framework

Most web frameworks make you choose between speed and a productive environment. Phoenix gives you both.

FastAPI logo FastAPI

FastAPI is an Open Source, modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.
  • Phoenix Framework Landing page
    Landing page //
    2021-07-28
  • FastAPI Landing page
    Landing page //
    2023-05-14

Phoenix Framework features and specs

  • High Performance
    Phoenix leverages the Erlang VM, which is known for its low-latency and high-performance characteristics, making it ideal for real-time applications.
  • Scalability
    Built on the Elixir language, Phoenix inherits the ability to handle many concurrent connections without sacrificing performance, facilitating easy scalability.
  • Real-time Functionality
    Phoenix provides built-in support for WebSockets and channels, enabling real-time features like chat applications or live notifications with ease.
  • Fault Tolerance
    Thanks to Erlang's design, Phoenix applications are highly fault-tolerant and can maintain uptime even when certain processes fail.
  • Productivity and Maintainability
    Features like LiveView and a robust system of conventions can increase developer productivity by reducing boilerplate code and simplifying complex workflows.

Possible disadvantages of Phoenix Framework

  • Smaller Community
    Compared to more established frameworks like Django or Rails, Phoenix has a smaller community, which can mean fewer resources and third-party libraries.
  • Learning Curve
    For those unfamiliar with Elixir or functional programming, Phoenix can have a steep learning curve, requiring developers to familiarize themselves with new concepts.
  • Ecosystem Maturity
    While growing, the Elixir ecosystem is younger than others, potentially translating to fewer tools, libraries, or pre-built solutions for specific needs.
  • Deployment and Hosting
    Deploying and hosting Elixir applications can be more challenging than more common languages, though solutions like Gigalixir are improving this aspect.
  • Complex Debugging
    Debugging concurrent applications can be inherently more complex and may require a deeper understanding of concurrent process architecture.

FastAPI features and specs

  • High Performance
    Built on Starlette and Pydantic, FastAPI is one of the fastest frameworks for Python, providing high performance due to its asynchronous request handling.
  • Automatic Interactive API Documentation
    FastAPI automatically generates interactive API documentation via Swagger UI and ReDoc, which are very helpful for development and testing.
  • Type Checking and Validation
    With Pydantic models and Python type hints, FastAPI provides automatic data validation and type checking, reducing the chance of runtime errors.
  • Ease of Use
    Its syntax and design make it easy to learn for Python developers, offering a smooth development experience while reducing boilerplate code.
  • Asynchronous Support
    FastAPI supports asynchronous programming, allowing for better performance for I/O-bound operations, making it optimal for handling many simultaneous connections.
  • Extensive Documentation
    It has comprehensive and well-structured documentation, which is very useful for both beginners and advanced users.
  • Community and Ecosystem
    FastAPI has a growing community and ecosystem, with many plugins and integrations available to extend its functionality.

Possible disadvantages of FastAPI

  • Learning Curve for Asynchronous Programming
    Although FastAPI itself is easy to learn, grasping the concepts of asynchronous programming in Python can be challenging for beginners.
  • Complex Dependencies
    Using Pydantic for advanced validation can make the request models complex, requiring a deeper understanding of Pydantic and its functionalities.
  • Early Stage Libraries
    Some third-party libraries and extensions specifically tailored for FastAPI might still be in early stages of development and lack long-term stability.
  • Limited Real-World Examples
    Although the documentation is extensive, there might be limited real-world examples and case studies readily available compared to more mature frameworks.
  • Deployment Complexity
    Deploying FastAPI applications might be more complex in comparison to traditional synchronous frameworks, mainly due to the need for asynchronous server setups.

Phoenix Framework videos

Phoenix LiveView for web developers who don't know Elixir.

FastAPI videos

FastAPI from the ground up

More videos:

  • Tutorial - 30 Days of Python - Day 14 - Web App with Flask, FastAPI, ngrok, and Invictify - Python TUTORIAL
  • Review - [PT] Python - API com FastAPI - Chat | twitch.tv/codeshow

Category Popularity

0-100% (relative to Phoenix Framework and FastAPI)
Web Frameworks
16 16%
84% 84
Developer Tools
6 6%
94% 94
Programming Language
100 100%
0% 0
API Tools
0 0%
100% 100

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Phoenix Framework and FastAPI

Phoenix Framework Reviews

The 20 Best Laravel Alternatives for Web Development
Phoenix rises with the grace of Elixir, flaunting real-time features and robustness that could make even seasoned frameworks blush. It’s about fast, maintainable web experiences, not just quick fixes.
Top 10 Phoenix Framework Alternatives
In the following post, we take a detailed look at what Phoenix Framework brings to the world of software development and then discuss some of the top Phoenix alternatives available to developers.

FastAPI Reviews

The 20 Best Laravel Alternatives for Web Development
FastAPI, as the name hints, is a swift mover. Built on Starlette, it’s all about speed and performance with Python. Crafting API masterpieces at the speed of light, now that’s something.
25 Python Frameworks to Master
Since its release in 2018, it has rapidly gained popularity due to its great performance and simplicity. In fact, according to PyPi Stats, FastAPI has over 9 million monthly downloads, surpassing even full-stack frameworks like Django.
Source: kinsta.com
3 Web Frameworks to Use With Python
myapp/ is the main directory of your FastAPI application. It includes all the other files and directories needed for the application.static/ is a directory used to store static assets such as CSS, JavaScript, and image files. These assets are served directly by the web server and are typically used to add visual styling and interactivity to the application.css/, img/, js/...
Best Alternatives to FastAPI App Free for Windows (2021)
FastAPI Alternative – So many alternatives app to FastAPI that you must to know out there. And, looking for an ideal software was not easy matter. Lucky you, at this page you can find the best replacement app for FastAPI. So what you are waiting for, get the latest FastAPI alternative app for Windows 10 from this page.
Top 5 Back-End Frameworks to Consider for Web Development in 2021
FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints. It is fast when compared to other major Python frameworks like Flask and Django. FastAPI gives great flexibility to fulfill businesses’ API needs in today’s evolving world.

Social recommendations and mentions

Based on our record, FastAPI seems to be a lot more popular than Phoenix Framework. While we know about 286 links to FastAPI, we've tracked only 13 mentions of Phoenix Framework. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Phoenix Framework mentions (13)

  • Supervisors - Letting things crash
    The usage of those supervisors create what we call a supervision tree, and it's what drives a lot of big frameworks such as Phoenix to provide fault-tolerant control and visualization for the process in your application, this give us much more control and performance while trusting the awesome Erlang VM. - Source: dev.to / over 1 year ago
  • Why Tailwind CSS Won
    I am a not-good-at-ui dev, meaning I _can_ build UIs pixel perfect if given some exact design files, but it is incredible hard for me to come up with things on my own. So whenever I build something that is not already defined fully by designers (like: most of the time), I have to use some UI component catalog like bootstrap and start assembling my UI based on the options there, at most I switch a theme file to... - Source: Hacker News / over 1 year ago
  • Using Panic's Nova.app for Elixir and Phoenix Development
    a few weeks a go I started to learn Elixir and Phoenix Framework. - Source: dev.to / over 2 years ago
  • The new wave of Javascript web frameworks
    Phoenix LiveViews works like that, and the HTML diffs are efficiently generated using some of Elixir (and Erlang) concepts. Granted, you have to learn a new language, but once you get it, it's really nice to work with. Source: over 2 years ago
  • Elixir As Your First Functional Language
    There are key frameworks that are very mature in Elixirs such as Phoenix for web applications and Nerves for hardware. - Source: dev.to / almost 3 years ago
View more

FastAPI mentions (286)

  • Building Weather & History Story Cards with Python and FastAPI
    By the end of this tutorial, you’ll see how I used FastAPI and Jinja2 to turn raw JSON into a dynamic timeline of weather and history that feels informative and fun. - Source: dev.to / 12 days ago
  • Build Code-RAGent, an agent for your codebase
    The only thing left to do then was to build something that could showcase the power of code ingestion within a vector database, and it immediately clicked in my mind: "Why don't I ingest my entire codebase of solved Go exercises from Exercism?" That's how I created Code-RAGent, your friendly coding assistant based on your personal codebases and grounded in web search. It is built on top of GPT-4.1, powered by... - Source: dev.to / 13 days ago
  • Understanding the Relation Between FastAPI and Uvicorn
    FastAPI and Uvicorn are two essential building blocks when developing high-performance Python APIs. - Source: dev.to / 14 days ago
  • Python: Why Quart Might Be the Better Choice over FastAPI
    Python's diverse ecosystem of web frameworks offers developers a wide range of choices for building robust and efficient applications. In the realm of asynchronous frameworks, Quart and FastAPI have emerged as popular options. While FastAPI has gained considerable attention for its speed and developer-friendly features, Quart presents a compelling alternative, especially for those already familiar with the Flask... - Source: dev.to / 24 days ago
  • Partner Models for Payments: How Rapyd Powers Partner Payment Solutions
    Let's look at how to use Rapyd to build a simple system where you can onboard merchants, add products, receive payments, and receive payouts, all powered by Rapyd's API. To fully integrate this system, businesses can sign up as a Rapyd partner to access additional capabilities for managing merchant transactions. In this tutorial, you'll see how to use the FastAPI framework in Python to create endpoints for each... - Source: dev.to / about 1 month ago
View more

What are some alternatives?

When comparing Phoenix Framework and FastAPI, you can also consider the following products

Elixir - Dynamic, functional language designed for building scalable and maintainable applications

Django - The Web framework for perfectionists with deadlines

Laravel - A PHP Framework For Web Artisans

Flask - a microframework for Python based on Werkzeug, Jinja 2 and good intentions.

Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.

ExpressJS - Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple