1. Key difference 1: Architecture and purpose: Amazon Kinesis and Postman serve different purposes and are designed with different architectures. Amazon Kinesis is a fully managed service that allows real-time data streaming for big data analytics and processing. It is optimized for high throughput and horizontal scalability, making it suitable for data-intensive applications. On the other hand, Postman is a collaboration platform for API development and testing. It provides tools for API documentation, testing, and monitoring, helping developers streamline the API development process.

2. Key difference 2: Data processing capabilities: Another significant difference between Amazon Kinesis and Postman lies in their data processing capabilities. Amazon Kinesis offers real-time data processing and analytics, enabling users to collect, process, and analyze large volumes of streaming data in real-time. It provides features like data transformations, real-time analytics, and integration with other AWS services. In contrast, Postman focuses more on API testing and monitoring rather than data processing. It offers features like request scripting, automated testing, and performance monitoring for APIs.

3. Key difference 3: Scalability and performance: When it comes to scalability and performance, Amazon Kinesis has the advantage due to its architecture and purpose. It is built to handle massive workloads and scale horizontally to accommodate increasing data streams and processing requirements. Amazon Kinesis can handle unlimited data streams with high throughput and low latency. On the other hand, while Postman offers features like load testing and performance monitoring for APIs, it may not be suitable for handling large-scale data processing tasks with the same performance and scalability as Amazon Kinesis.

4. Key difference 4: Management and maintenance: Amazon Kinesis is a fully managed service provided by AWS, which means that AWS handles infrastructure management, maintenance, and backups. Users only need to configure their data streams and define the processing logic. It simplifies the operational overhead and reduces the need for manual maintenance. In contrast, Postman is a developer tool that requires users to set up and manage their own environment. It needs to be installed on the user's machine, and users are responsible for keeping it up-to-date and managing their API collections.

5. Key difference 5: Integration and ecosystem: Amazon Kinesis is part of the comprehensive AWS ecosystem, which includes various cloud services such as storage (Amazon S3), analytics (Amazon Redshift), and serverless computing (AWS Lambda). It seamlessly integrates with other AWS services, allowing users to build scalable and powerful data processing pipelines. On the other hand, while Postman provides integrations with popular development tools and platforms, it does not offer the same level of integration with cloud services or ecosystem as Amazon Kinesis.

6. Key difference 6: Pricing model: Finally, the pricing models for Amazon Kinesis and Postman differ significantly. Amazon Kinesis pricing is primarily based on the volume of data ingested, data transferred, and data analyzed. The pricing scales with usage, and users only pay for what they use. On the other hand, Postman offers a subscription-based pricing model, where users pay a fixed monthly or annual fee for access to certain features and additional support. The pricing is not directly tied to data processing or usage.

In summary, Amazon Kinesis is a fully managed service optimized for real-time data streaming and processing, offering scalability, high performance, and integration with the AWS ecosystem. Postman, on the other hand, is a collaboration platform for API development and testing, focusing on API testing, monitoring, and documentation.