What are the best CI solutions for cross-platform mobile apps?

I'd like you to focus on the basics. In order to have CI you need to practice Continous Integration. This requires making small and frequent commits and integrating daily with the whole team in a branch. Ideally you work on something like Trunk Based Development, but also you need confidence that your code doesn't break your colleagues work. So it is important to have tests, ideally you practice TDD. Now with this test suite you can wrap it in some operations to execute before merging. The simplest way in my experience, was to integrate Fastlane and then connect it to a platform like BitRise or Jenkins.

I usually opt for GitHub build agents such as macOS and Windows, and then I use Fastlane. If the customer is using Active Directory, I utilize App Center for internal distribution.

Our choice is Jenkins ?? Jenkins is an open-source automation solution that supports building, deploying, and automating any project, including mobile apps. It has a large and active community and supports many plugins ??

Don't rely too much on the individual features of each platform. I like to do wrap all my testing operations using fastlane and then it becomes a breeze to just run one lane or the other. I need just the git integration and triggers of the platform. It will be easier to integrate with Jenkins or if you go with a paid solution, you will be more flexible to switch in the future when the prices increase.

Travis CI offers comprehensive support for various mobile app platforms. It provides first-class support for Android development, ensuring seamless integration and testing. For iOS apps, Travis CI includes Xcode environments, catering to the specific needs of iOS development. Additionally, since React Native apps compile into native Android and iOS applications, they are also well-supported on Travis CI for testing and deployment. Furthermore, Travis CI extends its capabilities to Flutter apps, accommodating the growing popularity of this cross-platform framework.

Cloud-Based CI/CD Integration Explore cloud-based Continuous Integration/Continuous Deployment (CI/CD) solutions that offer seamless integration with popular version control systems (e.g., Git) and provide scalable resources for running cross-platform mobile app tests. Utilizing a cloud-based CI/CD system enhances flexibility, allows parallel testing on multiple platforms, and streamlines the testing process.