Buildbot vs LambCI: What are the differences?

Buildbot: Python-based continuous integration testing framework. BuildBot is a system to automate the compile/test cycle required by most software projects to validate code changes. By automatically rebuilding and testing the tree each time something has changed, build problems are pinpointed quickly, before other developers are inconvenienced by the failure; LambCI: A continuous integration system built on AWS Lambda. LambCI is a package you can upload to AWS Lambda that gets triggered when you push new code or open pull requests on GitHub and runs your tests (in the Lambda environment itself) – in the same vein as Jenkins, Travis or CircleCI.

Buildbot and LambCI can be primarily classified as "Continuous Integration" tools.

Buildbot and LambCI are both open source tools. It seems that Buildbot with 4K GitHub stars and 1.37K forks on GitHub has more adoption than LambCI with 3.6K GitHub stars and 210 GitHub forks.