Customer.io

What it does

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Customer.io is a lifecycle messaging platform that lets a company build automation triggered by specific user behavior, like signing up, abandoning an in-app action, or hitting a usage milestone, rather than just sending scheduled campaigns to a static list. Messages can go out over email, SMS, push notification, or webhook from one workflow builder.

What sets it apart is how deep the event-based logic goes. A team can build a flow that waits for a specific in-app action, branches based on whether it happened within a set time window, and personalizes the message using any data point attached to that user, a level of behavioral targeting most email tools don't attempt.

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Who this helps

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• A SaaS company that wants onboarding and retention emails triggered by actual product usage rather than a fixed schedule.

• A product team with engineering resources to send custom event data into the platform.

• A growth marketer who needs to branch a workflow based on whether a user completed a specific in-app action.

• Not a fit for a small business or agency client without a developer to wire up the event tracking.

Free tier:

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See the vendor site for current free tier details.