FastAPI icon
FastAPI icon

FastAPI

FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.

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Cost / License

  • Free
  • Open Source (MIT)

Application type

Platforms

  • Mac
  • Windows
  • Linux
  • Self-Hosted
26likes
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Features

  1.  Asynchronous
  2.  OpenAPI Integration
  3.  REST API

FastAPI News & Activities

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Recent activities

  • Anton Kylikov liked FastAPI
  • Hamze Zare reviewed FastAPI  

    Backend for close to a dozen services at this point (FanDesk, our CMS, a couple of internal tools) - all Python underneath. The auto-generated OpenAPI docs alone save a stupid amount of frontend/backend back-and-forth once more than one person touches an API, and Pydantic catching a bad payload before it reaches business logic has probably saved more debugging time than any other single framework choice we've made. Only real friction: mixing sync and async bites you occasionally if a dependency...

  • Hamze Zare liked FastAPI
  • eliasbuenosdias liked FastAPI
  • VeloIQ icon
    cesarlugos1s added FastAPI as alternative to VeloIQ
  • Kurslog Team reviewed FastAPI  

    We switched to FastAPI for our core services, and the performance gain was immediate. The automatic interactive documentation (Swagger UI) is a lifesaver for team collaboration. Type hinting with Pydantic makes the code much cleaner and reduces bugs significantly compared to Flask. If you're building a data-heavy application where speed and developer experience matter, this is the gold standard for Python.

  • Kurslog Team liked FastAPI
  • Flet icon
    Gergely Turi added FastAPI as alternative to Flet
  • Paul added Web Framework as a feature to FastAPI
  • Fardin Alizadeh rated FastAPI  

Comments and Reviews

   
Top Positive Comment
mbnoimi
1

Developers friendly

Hamze Zare
0
Founder at fanpino

Backend for close to a dozen services at this point (FanDesk, our CMS, a couple of internal tools) - all Python underneath. The auto-generated OpenAPI docs alone save a stupid amount of frontend/backend back-and-forth once more than one person touches an API, and Pydantic catching a bad payload before it reaches business logic has probably saved more debugging time than any other single framework choice we've made. Only real friction: mixing sync and async bites you occasionally if a dependency isn't actually async under the hood, and it shows up as a mysteriously stalled event loop instead of a clear error.

Kurslog Team
0
Kurslog

We switched to FastAPI for our core services, and the performance gain was immediate. The automatic interactive documentation (Swagger UI) is a lifesaver for team collaboration. Type hinting with Pydantic makes the code much cleaner and reduces bugs significantly compared to Flask. If you're building a data-heavy application where speed and developer experience matter, this is the gold standard for Python.

Review from a new or low-activity account — shown here, but not counted in the app rating.
linmanden
0

I like FastAPI, because the documentation is not a nerd explaining to nerds, but an expert explaining to normal people. I am still going through the documentation, so I can not say much more :-)

Review from a new or low-activity account — shown here, but not counted in the app rating.
ishanmitra020
0

fast, easy to code and intuitive

Review from a new or low-activity account — shown here, but not counted in the app rating.
willwang
0

Really awesome :)

Review from a new or low-activity account — shown here, but not counted in the app rating.
Ilya Gotfryd
0

It is exceptionally clean, does wonders to object serialization through Pydantic, is exceptionally performant, very easy to configure a production-ready version. I was completely swayed by documentation from the first time I saw it. Great work all around.

Review from a new or low-activity account — shown here, but not counted in the app rating.
7 of 10 comments

Featured in Lists

Xenmaster's 2026 Back-End Web Development Catalog

This list is an update to the list I created seven years ago https://alternativeto.net/lists/8010/back-end-web-development/ which focused on the server-side aspect of web applications. The web and development has changed a lot since then and rather than re-write history, decided to create a new list based on current patters and shifts in enterprise environments. These details are based on both what I've seen in the professional world as well as for hobbyists and web development enthusiasts who run their own projects. The general pattern for back-end development will cover three main points for each function: Self Hosted Option Third-Party Service Option AWS Option I also cover any GUI interfaces available for folks who don't want to interact with these services using a terminal. In addition to consulting the documentation for each of the tools below, I'd like to shout out the following projects which also played a big part in informing the overall structure of this list: Jeff Delaney's 100 Second Videos: https://www.youtube.com/@Fireship Kamran Ahmed's Roadmaps: https://roadmap.sh Stack Overflow's Developer Survey: https://survey.stackoverflow.co/2025/ The beginning of this list will cover some common languages used to build server-based APIs for web applications, including Python, Javascript, C#, and Go. Honorable mentions, some of which were from my original list, include the following: Rails with Ruby: one of the best developer experiences but counterbalanced by terrible performance from a speed and efficiency perspective. This framework is still really popular in India. Spring Boot with Java: A very common enterprise-based application framework and particularly popular in China. But it requires Java, which I wouldn't wish on anyone. Laravel with PHP: PHP gets a lot of hate, but I used it back 20 years ago and am still fond if it. PHP is generally useful for Wordpress-based sites too. Has performance issues though since it is an interpreted language. Phoenix with Elixir: Also a great developer experience and is very popular on the Stack Overflow survey. Only reason I can't recommend is because you will be learning Elixir just to use Phoenix because it isn't a language really used for anything else mainstream. Note that I don't plan on covering anything AI related for the development process. Of Generative AI, wickedest of technological inventions, I shall neither speak nor give direction.
By Xen Master91 appsUpdated

Official Links

Install from the command line

  • brew install fastapi

Be careful what you paste into a terminal. Check what a command installs before running it.

What is FastAPI?

FastAPI framework, high performance, easy to learn, fast to code, ready for production

FastAPI information

AlternativeTo Category

Development

GitHub repository

  •  102,958 Stars
  •  10,017 Forks
  •  87 Open Issues
  •   Updated  
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Our users have written 10 comments and reviews about FastAPI, and it has gotten 26 likes

FastAPI was added to AlternativeTo by tiangolo on and this page was last updated .