1. Integration with Package Managers: Dependabot supports a wide range of package managers such as npm, Bundler, Maven, and more, while Dependency CI is specifically tailored to work with GitHub and GitLab repositories.

2. Configuration Options: Dependabot provides more flexibility in terms of configuration options, allowing users to customize aspects like frequency of dependency updates, version ranges, and notifications. In contrast, Dependency CI focuses on simplicity, offering fewer configuration choices for a straightforward setup process.

3. Approach to Security Vulnerabilities: Dependabot is known for its timely security updates and vulnerability alerts, detecting and auto-fixing issues efficiently. On the other hand, Dependency CI primarily focuses on detecting dependency conflicts and prioritizes ensuring compatibility across dependencies.

4. User Interface: Dependabot offers a user-friendly interface with detailed logs and information on each dependency update, making it easier for users to track changes. Dependency CI, however, maintains a more streamlined interface focusing on essential information required for managing dependencies effectively.

5. Free vs. Paid Plans: Dependabot is part of GitHub's services and is provided as a free feature to users, integrated seamlessly into the platform. On the contrary, Dependency CI offers both free and paid plans based on the level of support and features required, catering to different user needs.

6. Customization and Extensibility: Dependabot allows users to extend its functionality through custom scripts and workflows, providing more advanced customization options. Dependency CI, in comparison, has a more closed system with limited possibilities for customization beyond its core features.

In Summary, Dependabot and Dependency CI differ in terms of package manager support, configuration options, security approach, user interface, pricing plans, and customization capabilities.