Flipper

Feature flags that live in your own datastore, with a mountable UI for changing them.

What you get

• Boolean, actor, group and percentage-of-time gates
• Adapters for Active Record, Redis and others
• A web UI mounted in your app
• Flag checks that are a local lookup, not a network call

Mounting it

# Gemfile
gem "flipper"
gem "flipper-active_record"
gem "flipper-ui"

# config/routes.rb
constraints ->(request) { request.env["warden"].user&.admin? } do
  mount Flipper::UI.app(Flipper), at: "/flipper"
end

The latency argument

A hosted flag service either adds a network hop to every check, or ships an SDK that
caches and then eventually-consistently diverges. Flipper reads from a table you are
already querying.