1. Integration Capabilities: Postman is primarily used for testing APIs, while ShipStation is designed for managing e-commerce order fulfillment. ShipStation offers robust integrations with various shopping carts, marketplaces, and carriers, enabling seamless order processing and shipment tracking. In contrast, Postman's integrations are more focused on API testing and development, offering a wide range of tools for debugging and monitoring API endpoints.

2. User Interface: ShipStation provides an intuitive and user-friendly interface to streamline order processing, label printing, and shipment tracking. On the other hand, Postman offers a more technical and developer-centric interface, with features such as request building, response visualization, and automated testing functionalities. The user interface difference reflects the distinct purposes of the two platforms, catering to different user groups.

3. Automation Capabilities: ShipStation offers automation features like rules and workflows to automate order processing tasks, label creation, and shipment notifications. In contrast, Postman focuses on API automation through scripts and collections, allowing users to automate API testing, monitoring, and documentation processes. The automation capabilities of both platforms serve different purposes based on their target users and use cases.

4. Reporting and Analytics: ShipStation provides detailed reports and analytics on order fulfillment, shipping costs, carrier performance, and customer insights to help businesses optimize their shipping processes and improve customer satisfaction. On the other hand, Postman offers basic reporting features for API testing and monitoring, focusing more on debugging and performance analysis of APIs. The reporting capabilities of ShipStation cater to e-commerce businesses' specific needs, while Postman's reporting is tailored to API development requirements.

5. Multi-Channel Support: ShipStation supports multi-channel selling by integrating with various sales channels, including e-commerce platforms, marketplaces, and shopping carts. This allows businesses to centralize order management and shipment processing across multiple channels. In contrast, Postman is primarily focused on API testing and development, with limited support for multi-channel integration. The multi-channel support of ShipStation distinguishes it as a comprehensive solution for e-commerce order fulfillment.

6. Customer Support: ShipStation offers dedicated customer support, including phone, email, and chat support, to assist users with setup, troubleshooting, and training. Postman provides community support through forums, documentation, and tutorials, catering to a more self-service approach for technical assistance. The difference in customer support reflects the target audience and requirements of each platform, with ShipStation prioritizing personalized assistance for e-commerce businesses' operational needs.

In Summary, Postman and ShipStation offer distinct functionalities tailored to API testing and e-commerce order fulfillment, respectively, with differences in integration capabilities, user interface, automation, reporting, multi-channel support, and customer support.