FastAPI Alternatives

Flask is a micro framework framework written in Python that can be used to build APIs, web services and web applications. Flask is designed from the bottom up to be extremely minimal and easy to use, where your whole application can fit into one single Python file. The framework includes no database abstraction layer, form validation, or any other components, by design. However pre-existing third-party libraries provide common functionality needed to build production ready applications and services.

A free and open-source web framework and asynchronous networking library written in Python. Tornado was originally developed at FriendFeed, and is using a non-blocking network I/O that can be used to scale applications to tens of thousands of concurrent connection. Tornado is a great framework for applications that require long-lived connections between users, and for WebSockets or long polling.

Fiber is an extremley fast web framework written in Go. The framework built on top of Fasthttp which is the faster HTTP engine avalible for Go. Fiber is free and open-source and is designed for fast application development with zero memory allocation and performance in mind.

Bottle is a fast, simple and lightweight WSGI micro web-framework for Python. The framework can be used to create lean web applications with Python 2.7 and 3.x. Bottle is distributed as a single file module with no additional dependencies which makes it really easy to get started and later in the development-stage to manage.

The Falcon Web Framework is a free and open-source application framework written in Python.

Django is a high-level Python web development framework used for building web application at scale with speed. The framework adhere to a clean and pragmatic design that lets developers develop rapidly. Django ships as a "batteries included" framework and contains many of the features needed for most web applications such as an admin panel, an ORM and templating language. It takes much of the hassle out of web development and lets developers focus on writing their application instead of focusing on authentication, authorization and security.

Laravel is an extremely popular, free and open source web application framework with expressive, elegant syntax. The framework is written in PHP and provides a developer experience that rival most web application frameworks on the market today. The structure and built-in features of Laravel allows developers to build web applications faster. Instead of setting up tooling and configuring settings, developers can focus on the important task at hand, making their ideas into reality.

CherryPy is a free and open-source object-oriented HTTP and web framework written in Python. CherryPy allows developer to build web application the same way they would build any other object-oriented program. The design of CherryPy result in a simpler and faster development experience with more readable code. CherryPy is distributed under a BSD license and loved by many Python web developers.

Ruby on Rails is an iconic, free and open source, server-side web application framework released under the liberal MIT license. The Ruby-based framework has helped millions of developer make their ideas a reality. The framework is opinionated and promotes best standards and practices for web development. When combining that with a community that is open, helpful and guiding, it's not hard to see why Ruby on Rails is one of the most loved web application frameworks to this day. Ruby on Rails is also used by industry giants like Basecamp, HEY, GitHub, Shopify, Airbnb, Twitch, SoundCloud, Hulu, Zendesk, Square, Cookpad.

Build powerful, scalable applications, with minimal overhead and full out-of-the-box functionality with Hapi. It's a free and open-source JavaScript framework for Node.js that is developed for enterprise-grade applications. Companies like Walmart, Brave and Condé Nast build web-services with Hapi and rely on it at scale.

AdonisJS is a Node.js web framework designed for building micro-services with JavaScript and Typescript. The framework provides an elegant syntax and and the tools that gives developers the confidence to build structured projects at scale. AdonisJS also includes its own ORM called Lucid, which is an implementation of Active Record, written in JavaScript. The framework will make anyone coming from Laravel or Ruby on Rails to feel right at home in the JavaScript eco-system.

Sinatra is a free and open source DSL library for quickly creating web applications in Ruby with minimal effort. Sinatra is loved by many due to its simplicity and ease-of-user. For Ruby developers, Sinatra is an alternative to web application frameworks like Ruby on Rails, Merb, Nitro, and Camping.