fastlane lets you define and run your deployment pipelines for different environments. It helps you unify your app’s release process and automate the whole process. fastlane connects all fastlane tools and third party tools, like CocoaPods.
What is
Bitrise?
In short Bitrise is a Continous Integration and Delivery (CI/CD) Platform as a Service (PaaS) with a main focus on mobile app development (iOS, Android). You can automate the testing and deployment of your apps with just a few clicks. When you trigger a build a Virtual Machine is assigned to host your build and your defined Workflow (series of Steps scripts) will be executed, step by step.
What is
Greenhouse?
Greenhouse automatically builds your project for every commit you make and runs all your unit or UI tests on the emulator/simulator or on real hardware. Automatic build distribution is also supported so that your team and clients are always up to date with the latest state of your apps.
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Fastlane is a perfect tool for the build distributions. Its pretty simple settings allow composing the app builds just with one command. For Flutter it is set up for distributing Crashlytics and Test Flight builds.