Top 12 Open-Source Alternatives to Flask

The top open-source alternatives to Flask are Django, Laravel, and Ruby on Rails. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Django Landing Page
1

Django

The Web framework for perfectionists with deadlines
Pricing:
- Open Source
#Python Web Framework #Python MVC Framework #Web Frameworks 14 social mentions
Laravel Landing Page
2

Laravel

A PHP Framework For Web Artisans
Pricing:
- Open Source
#Developer Tools #Web Frameworks #PHP Framework 194 social mentions
Ruby on Rails Landing Page
3

Ruby on Rails

Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
Pricing:
- Open Source
#Developer Tools #Web Frameworks #Frameworks (Full Stack) 117 social mentions
ExpressJS Landing Page
4

ExpressJS

Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
Pricing:
- Open Source
#JavaScript Framework #Node.js Framework #Web Frameworks 425 social mentions
CodeIgniter Landing Page
5

CodeIgniter

A Fully Baked PHP Framework
Pricing:
- Open Source
#PHP Web Framework #Web Frameworks #Frameworks (Full Stack) 8 social mentions
Meteor Landing Page
6

Meteor

Meteor is a set of new technologies for building top-quality web apps in a fraction of the time.
Pricing:
- Open Source
#Web Frameworks #Developer Tools #Python Web Framework 10 social mentions
Yii Framework Landing Page
7

Yii Framework

Yii is a high-performance component-based PHP framework best for Web 2.0 development.
Pricing:
- Open Source
#PHP Framework #PHP MVC Framework #Web Frameworks
CakePHP Landing Page
8

CakePHP

The Rapid Development Framework for PHP
Pricing:
- Open Source
#PHP Web Framework #PHP MVC Framework #Web Frameworks 9 social mentions
FastAPI Landing Page
9

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.
Pricing:
- Open Source
- Free
#Developer Tools #API Tools #Python Programming 233 social mentions
Shiny Landing Page
10

Shiny

Shiny is an R package that makes it easy to build interactive web apps straight from R.
Pricing:
- Open Source
#Web Frameworks #Developer Tools #Python Web Framework 32 social mentions
Koa.js Landing Page
11

Koa.js

Next generation web framework for node.js
Pricing:
- Open Source
#Web Frameworks #MVC Framework #NodeJS Framework 36 social mentions
Grails Landing Page
12

Grails

An Open Source, full stack, web application framework for the JVM
Pricing:
- Open Source
#Web Frameworks #Developer Tools #Python Web Framework 5 social mentions