Flutter is an open-source framework developed by Google that allows developers to build beautiful, natively compiled, multi-platform applications from a single codebase. It supports various platforms including mobile, web, desktop, and embedded apps. The article discusses the CI/CD infrastructure for Flutter, comparing GitHub Actions and Bitrise in terms of their continuous integration and delivery options. Both platforms offer different features such as parallelization, source code management, workflows, and testing steps. Bitrise is integrated with various source code management platforms like GitHub, Bitbucket, or GitLab, while GitHub Actions only integrates with GitHub. The article highlights the differences between the two platforms in terms of pricing, build times, and deployment options.