Testing is a crucial component of mobile app development, ensuring quality, security, and reliability before release. Developers have the option of conducting self-hosted or cloud-based mobile testing, each with distinct advantages. Self-hosted testing provides control over configurations and data security, making it suitable for industries requiring stringent compliance, like healthcare. However, it demands significant resources and maintenance. Conversely, cloud-based testing offers scalability, flexibility, and cost-effectiveness, utilizing third-party infrastructure for rapid test execution through virtualization and parallelization, which accelerates the development cycle by enabling multiple configurations to be tested concurrently. While self-hosted testing might be necessary for specific use cases, cloud-based testing is generally more efficient for most mobile app testing needs. CircleCI supports cloud-based testing, offering tools to streamline mobile app development within a continuous integration and delivery framework.