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.
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Rolling deploys are awesome! We use Unicorn to keep downtime to a minimum as we iterate quickly for our clients.
"deploy + forget" application deployment with good default configuration.