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Every YC batch runs through Rails — applications, Bookface, office hours, all of it

~2M lines of Rails. 1,000+ engineers. Deploys 20x/day. Upgrades Rails every week

Massive Ruby on Rails monolith powering millions of financial transactions

124M+ sentry-ruby gem downloads. First-class Rails tracing, profiling, and error tracking

2M-line Rails monolith since 2007. Powers millions of devices across millions of networks

Born in 2008 as a Rails-only APM. 176M+ newrelic_rpm gem downloads. Ruby built the observability industry

Rails monolith powers product decisions at Microsoft, Zendesk, and thousands of companies

Ruby monolith on Sinatra + ActiveRecord handles the majority of web requests. DB scaled 100x, kept the monolith

Ex-Intercom. 2M-line Rails majestic monolith, 100K+ tests per PR in 6 minutes

$171B in assets administered through a Rails modular monolith. Moved microservices back in

The database company runs on Rails — dashboard, API, and control plane all built with it

Rails app serves 47% of US foster children. 550+ agencies across 36 states

Rails powers identity verification across 200+ countries. High-stakes, regulated, mission-critical

Rails since 2008. 270M users, 55M research papers. 18 years and still shipping

Ruby + Sinatra monolith, dozens of Ruby and Go microservices. 30M+ checks a year

One of the largest Rails shops anywhere. Two Rails monoliths, 150M+ Sidekiq jobs a day

136M+ downloads of the Ruby tracer. Donates the observability behind RubyGems.org

100+ open-source projects. Hundreds of millions of gem downloads. test-prof, AnyCable, imgproxy, action_policy, and many more