Flask Framework is described as 'Flask is a lightweight web application framework written in Python and based on the Werkzeug WSGI toolkit and Jinja2 template engine. There is no database abstraction layer, form validation, or any other components where third-party libraries already exist to provide common' and is a Web Framework in the development category. There are more than 10 alternatives to Flask Framework for a variety of platforms, including Linux, Windows, Mac, Self-Hosted and Python apps. The best Flask Framework alternative is Django, which is both free and Open Source. Other great apps like Flask Framework are FastAPI, ASP.NET, Frappe Framework and Reflex Framework.
Django is a high-level Python Web framework that encourages rapid development and clean, pragmatic design. Built by experienced developers, it takes care of much of the hassle of Web development, so you can focus on writing your app without needing to reinvent the wheel.
FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.
In my opinion, FastAPI wins over Flask because it has major features that are incredibly useful such as the Swagger UI Generator, compatibility with async.
Asp.net is an open source server-side Web application framework designed for Web development to produce dynamic Web pages, web sites, apps and services with HTML, CSS and JavaScript. You can also create Web APIs, mobile sites, use real-time technologies like Web Sockets and more!
Frappe is a full stack, batteries-included, web framework written in Python and Javascript.
Flet enables developers to easily build realtime web, mobile and desktop apps in Python. No frontend experience required.
ViUR – the Information System for the Google App Engine™ plattform – is a »sandbox« for designers and developers. With the help of ViUR you can easy build web applications running on Google's infrastructure.
Pyramid is an open source web framework written in Python and is based on WSGI. It is a minimalistic web framework inspired by Zope, Pylons and Django.
Crow is a C++ microframework for running web services. It uses routing similar to Python's Flask which makes it easy to use. It is also extremely fast, beating multiple existing C++ frameworks as well as non C++ frameworks.
Sinatra is a free and open source software web application library and domain-specific language written in Ruby. It is an alternative to other Ruby web application frameworks such as Ruby on Rails, Merb, Nitro, Camping, and Rango. It is dependent on the Rack web server interface.
The jam.py is an object-oriented, event-driven framework with hierarchical structure. All this, in combination with very tight DB/GUI coupling, is the base for the DRY (don't repeat yourself) principle that is underlying the framework.
Bottle is a fast, simple and lightweight WSGI micro web-framework for Python. It is distributed as a single file module and has no dependencies other than the Python Standard Library.
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It is very quick and easy to bootstrap a performant API with adequate responses, error handling and I/O validation