Backend frameworks

Ruby on Rails

106.9K sitesOpen source

Ruby on Rails is a server-side web application framework written in Ruby under the MIT License.

Used byAirbnb,Basecamp (37signals),GitLab,RD Station+1

Laravel

99K sitesOpen source

Laravel is a free, open-source PHP web framework.

Express

77.3K sitesOpen source

Express is a web application framework for Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs.

Used byGhost

Django

26.1K sitesOpen source

Django is a Python-based free and open-source web application framework.

Used byPostHog

Flask

613 sitesOpen source

Flask is a Python micro web framework ideal for rapidly constructing web applications, offering minimalism, flexibility, and modularity.

Used byDuolingo

Phoenix

87 sitesOpen source

Elixir web framework with real-time channels and LiveView.

Used byPlausible Analytics

Hono

60 sitesOpen source

Hono is a small, simple, and ultrafast web framework for the Edge.

Used byDocumenso,Resend

Fast, pragmatic web framework for Rust.

ASP.NET Core

Open source

Microsoft's cross-platform web framework for C#.

Web framework for Rust built on Tokio.

Type-safe web framework built for Bun.

FastAPI

Open source

FastAPI is a web framework for building APIs with Python, utilizing standard Python type hints.

Fastify

Open source

Fast, low-overhead web framework for Node.js with schema-based validation.

Gin

Open source

Fast HTTP web framework for Go.

NestJS

Open source

Structured TypeScript server framework with modules and dependency injection.

Used byCal.com

Spring Boot

Open source

Java framework for production-ready backends with little setup.

Used byCreditas,Hotmart,iFood