Customer.io
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Customer.io sends email and SMS triggered by user actions in your product. When someone completes a signup flow, views a feature for the first time, or hasn't logged in for a week, your workflow springs into action automatically. This event-driven approach means your messaging stays timely and relevant to what the user is actually doing.
The platform appeals to product and growth teams that can send event data via API or JavaScript snippet. It's built with technical users in mind, making it easier to manage complex behavioral triggers and test variations without heavy manual setup.