Following its acquisition by Apple, buddybuild announced the discontinuation of its Android builds and free iOS plans, prompting teams to seek alternative continuous integration (CI) systems for mobile development, such as CircleCI. The comparison between CircleCI and buddybuild highlights CircleCI's reliance on configuration files stored in a git repository, allowing for better audit trails, version restoration, and easy configuration replication across repositories. CircleCI leverages fastlane, an open-source tool, for code signing, testing, and deployment, ensuring compatibility with Apple and third-party services, whereas buddybuild provides built-in mechanisms. CircleCI's Workflows feature enables the integration of iOS and Android configurations within a single file, benefiting projects like React Native by facilitating parallel job execution and early failure detection using tools like swiftlint and Danger.