The article provides a comprehensive comparison between two popular CI/CD tools, Jenkins and TeamCity, emphasizing their unique features, installation processes, extensibility, and community support. Jenkins is highlighted as a widely used open-source tool with a rich plugin ecosystem and strong community backing, making it a cost-effective choice for smaller organizations. In contrast, TeamCity, developed by JetBrains, offers a more user-friendly interface with powerful out-of-the-box features and support for cloud integrations, though it requires a commercial license beyond a certain usage level. Both tools support continuous integration, continuous delivery, and parallel builds, but Jenkins is noted for its extensive customization capabilities through a vast array of plugins, while TeamCity is praised for its ease of use and intelligent CI server capabilities. Ultimately, the choice between Jenkins and TeamCity depends on factors such as project requirements, budget, and the need for open-source versus commercial solutions.