CircleCI runs continuous integration and delivery pipelines configured in YAML. Its cloud service offers managed execution environments alongside self-hosted runner options, while CircleCI Server is a distinct private deployment offering. Resource class, execution time, storage and network consumption matter when estimating costs; a headline build-minute allowance does not represent every machine type.
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Jenkins is a self-managed automation server for software builds, tests and delivery pipelines. Teams express pipeline stages in versioned Jenkinsfiles and extend the server through plugins and build agents. It offers substantial control over the execution environment, while leaving server security, plugin compatibility, capacity and backup operations with the organisation running it.