Pros from reviewers

• Easy and quick setup: CircleCI is valued for its simplicity and ease of setup. It allows for quick project configuration and once set up, there's seldom a need to revisit the platform. Builds can be operational in a few hours

• Integration with other tools: CircleCI integrates smoothly with tools like Slack, GitHub, and even supports building on macOS if required. It also integrates with iOS for building and testing mobile apps, and automating the entire CI/CD pipeline

• Excellent user interface and management: CircleCI has an excellent user interface that is straightforward and easy to use. It also offers robust features like running build/testing process steps in parallel, serving as a safety net for catching bugs and safe deployment

• Improved build speeds and parallelization: The build speeds have improved and the Workflows 2.0 feature allows for easy parallelization of tasks. It also supports quick parallel testing

• Docker support and customizability: CircleCI offers commendable Docker support and its management interface and Docker integration have made the setup and monitoring process incredibly easy. Circle 2.0 offers enhanced customizability and extra features.

Cons from reviewers

• High pricing: Some users have expressed concerns about CircleCI's pricing, suggesting that it could be more competitive or that a more advantageous free plan could be offered for beginners

• Cluttered interface at lower resolutions: The interface can become cluttered when filtering a project by Branch Name at lower resolutions, particularly on mobile devices or browser tabs

• Limited third-party tool integrations: Despite its powerful features, some users believe that CircleCI should offer more integrations with third-party tools

• Usability improvements needed in user management: Some users have reported that despite having multiple contributors to a repository, they can only add a limited number of them as users, and they are unable to add users who aren't contributors to the repo

• Lack of support for multi-project repos: Some users have expressed the need for tools that support multi-project repos, allowing them to keep their front and back-end code together in one repo while splitting the CI for them.