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Passenger
Passenger

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Unicorn

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Passenger vs Unicorn: What are the differences?

Developers describe Passenger as "A fast and robust web server and application server for Ruby, Python and Node.js". Phusion Passenger is a web server and application server, designed to be fast, robust and lightweight. It takes a lot of complexity out of deploying web apps, adds powerful enterprise-grade features that are useful in production, and makes administration much easier and less complex. On the other hand, Unicorn is detailed as "Rack HTTP server for fast clients and Unix". Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Slow clients should only be served by placing a reverse proxy capable of fully buffering both the the request and response in between Unicorn and slow clients.

Passenger and Unicorn can be categorized as "Web Servers" tools.

"Nginx integration" is the top reason why over 43 developers like Passenger, while over 80 developers mention "Fast" as the leading cause for choosing Unicorn.

Passenger and Unicorn are both open source tools. Passenger with 4.41K GitHub stars and 505 forks on GitHub appears to be more popular than Unicorn with 1.35K GitHub stars and 249 GitHub forks.

Code School, Fab, and Movielala are some of the popular companies that use Passenger, whereas Unicorn is used by Instacart, Harvest, and New Relic. Passenger has a broader approval, being mentioned in 380 company stacks & 40 developers stacks; compared to Unicorn, which is listed in 176 company stacks and 55 developer stacks.

What is Passenger?

Phusion Passenger is a web server and application server, designed to be fast, robust and lightweight. It takes a lot of complexity out of deploying web apps, adds powerful enterprise-grade features that are useful in production, and makes administration much easier and less complex.

What is Unicorn?

Unicorn is an HTTP server for Rack applications designed to only serve fast clients on low-latency, high-bandwidth connections and take advantage of features in Unix/Unix-like kernels. Slow clients should only be served by placing a reverse proxy capable of fully buffering both the the request and response in between Unicorn and slow clients.
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    What are some alternatives to Passenger and Unicorn?
    nginx
    nginx [engine x] is an HTTP and reverse proxy server, as well as a mail proxy server, written by Igor Sysoev. According to Netcraft nginx served or proxied 30.46% of the top million busiest sites in Jan 2018.
    Apache HTTP Server
    The Apache HTTP Server is a powerful and flexible HTTP/1.1 compliant web server. Originally designed as a replacement for the NCSA HTTP Server, it has grown to be the most popular web server on the Internet.
    Microsoft IIS
    Internet Information Services (IIS) for Windows Server is a flexible, secure and manageable Web server for hosting anything on the Web. From media streaming to web applications, IIS's scalable and open architecture is ready to handle the most demanding tasks.
    Apache Tomcat
    Apache Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations.
    OpenResty
    OpenResty (aka. ngx_openresty) is a full-fledged web application server by bundling the standard Nginx core, lots of 3rd-party Nginx modules, as well as most of their external dependencies.
    See all alternatives
    Decisions about Passenger and Unicorn
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    How developers use Passenger and Unicorn
    Avatar of SmartLogic
    SmartLogic uses UnicornUnicorn

    Rolling deploys are awesome! We use Unicorn to keep downtime to a minimum as we iterate quickly for our clients.

    Avatar of pludoni GmbH
    pludoni GmbH uses PassengerPassenger

    "deploy + forget" application deployment with good default configuration.

    Avatar of Avalanche Network
    Avalanche Network uses UnicornUnicorn

    Our super server that runs a web instance and a worker instance.

    Avatar of Trustroots
    Trustroots uses PassengerPassenger

    Serving NodeJS app together with Nginx.

    Avatar of douglasresende
    douglasresende uses UnicornUnicorn

    I use with my Ruby on Rails projects.

    Avatar of Karma
    Karma uses UnicornUnicorn

    Our go-to Ruby application server.

    How much does Passenger cost?
    How much does Unicorn cost?
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