A ruby client for the Customer.io event API.
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A ruby client for the Customer.io event API.

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Add this line to your application's Gemfile:

gem 'customerio'

And then execute:

$ bundle

Or install it yourself:

$ gem install customerio


Before we get started: API client vs. JavaScript snippet

It's helpful to know that everything below can also be accomplished through the Customer.io JavaScript snippet.

In many cases, using the JavaScript snippet will be easier to integrate with your app, but there are several reasons why using the API client is useful:

  • You're not planning on triggering emails based on how customers interact with your website (e.g. users who haven't visited the site in X days)
  • You're using the javascript snippet, but have a few events you'd like to send from your backend system. They will work well together!
  • You'd rather not have another javascript snippet slowing down your frontend. Our snippet is asynchronous (doesn't affect initial page load) and very small, but we understand.

In the end, the decision on whether or not to use the API client or the JavaScript snippet should be based on what works best for you. You'll be able to integrate fully with Customer.io with either approach.


Create an instance of the client with your customer.io credentials which can be found in your customer.io settings.

If you're using Rails, create an initializer config/initializers/customerio.rb:

Customerio.configuration do |config|
  config.site_id = "YOUR SITE ID"
  config.api_key = "YOUR API SECRET KEY"

By default, this gem identifies customers by just their id. However, a common approach is to use production_2342 as the id attribute for the javascript snippet. You'll want to use the same format by customizing the id in config/initializers/customerio.rb:

Customerio.configuration do |config|
  config.customer_id do |customer|

Identify logged in customers

Tracking data of logged in customers is a key part of Customer.io. In order to send triggered emails, we must know the email address of the customer. You can also specify any number of customer attributes which help tailor Customer.io to your business.

Attributes you specify are useful in several ways:

  • As customer variables in your triggered emails. For instance, if you specify the customer's name, you can personalize the triggered email by using it in the subject or body.

  • As a way to filter who should receive a triggered email. For instance, if you pass along the current subscription plan (free / basic / premium) for your customers, you can set up triggers which are only sent to customers who have subscribed to a particular plan (e.g. "premium").

You'll want to indentify your customers when they sign up for your app and any time their key information changes. This keeps Customer.io up to date with your customer information.

# Arguments
# customer (required)   - a customer object which responds to a few key methods:
#                         id          - a unique identifier for the customer
#                         email       - the customer's current email address
#                         created_at  - a timestamp which represents when the
#                                       customer was first created.
# attributes (optional) - a hash of information about the customer. You can pass any
#                         information that would be useful in your triggers.

$customerio.identify(customer, first_name: "Bob", plan: "basic")

Tracking a custom event

Now that you're identifying your customers with Customer.io, you can now send events like "purchased" or "watchedIntroVideo". These allow you to more specifically target your users with automated emails, and track conversions when you're sending automated emails to encourage your customers to perform an action.

# Arguments
# customer (required)   - the customer who you want to associate with the event.
# name (required)       - the name of the event you want to track.
# attributes (optional) - any related information you'd like to attach to this
#                         event. These attributes can be used in your triggers to control who should
#                         receive the triggered email. You can set any number of data values.

$customerio.track(user, "purchase", type: "socks", price: "13.99")


  1. Fork it
  2. Clone your fork (git clone git@github.com:MY_USERNAME/customerio-ruby.git && cd customerio-ruby)
  3. Create your feature branch (git checkout -b my-new-feature)
  4. Commit your changes (git commit -am 'Added some feature')
  5. Push to the branch (git push origin my-new-feature)
  6. Create new Pull Request