About build machines
For Bitrise CI, both Linux and Xcode stacks are available on several different build machine types. Each machine type offers several options with varying computing power, depending on your subscription plan.
You can configure a default machine type for each of your projects and you can also set Workflow-specific machine types. You can do this when selecting stacks for your project: Setting the stack for your builds.
You can also change build machine types for all projects owned by a single user or workspace using the API: Changing machine types in all apps at the same time.
Each Bitrise build machine has its own IP address range: you can allowlist these IP addresses to be able to access our build machines from, for example, a private cloud: Configuring your network to access our build machines
For more information about build and code security, see Code security.