1. Pricing Model: Customer.io offers a flexible pricing model based on the number of people in your audience and the messages sent, while Urban Airship's pricing is primarily based on the number of active devices and push notifications sent, which can become costly for large audiences.

2. User Interface: Customer.io provides a user-friendly and intuitive interface that allows users to easily create and customize campaigns without the need for technical expertise, whereas Urban Airship's interface may be more complex and require technical knowledge to navigate effectively.

3. Automation Capabilities: Customer.io excels in advanced automation capabilities, providing robust workflows and triggers based on user behavior and attributes, whereas Urban Airship may have limitations in terms of creating complex automation sequences.

4. Targeting Capabilities: Customer.io offers sophisticated targeting options, allowing users to segment their audience based on a wide range of criteria for personalized messaging, while Urban Airship may have more basic targeting capabilities with fewer segmentation options.

5. Integration Options: Customer.io provides seamless integration with various third-party applications and platforms, enhancing the overall functionality and allowing for a more streamlined workflow, whereas Urban Airship may have limited integration options with other software systems.

6. Customer Support: Customer.io is known for its responsive and helpful customer support team, offering timely assistance and guidance to users in need, while Urban Airship's customer support may be less reliable or slower in addressing inquiries or issues.

In Summary, Customer.io and Urban Airship differ in their pricing model, user interface, automation capabilities, targeting options, integration possibilities, and customer support quality when it comes to marketing automation solutions.