1. Collaboration Features: CoScreen focuses on real-time collaboration, allowing multiple users to share their screens simultaneously and work together on projects seamlessly. On the other hand, Join.me primarily emphasizes online meetings and presentations, providing basic screen sharing capabilities without the advanced collaboration features offered by CoScreen.

2. Interactivity: CoScreen enables users to interact with shared screens, allowing for joint control and simultaneous editing. Join.me, on the other hand, offers limited interactivity, primarily focusing on screen sharing for presentations and meetings without extensive collaborative capabilities.

3. Integration: CoScreen provides seamless integrations with popular tools like Slack, Jira, and more, enhancing productivity and workflow efficiency. In contrast, Join.me offers basic integrations, primarily with calendar apps and email clients, but lacks the deep integrations provided by CoScreen.

4. Audio and Video Quality: CoScreen ensures high-quality audio and video connections, optimizing communication and collaboration among users. Join.me offers decent audio and video quality but may not match the level of performance provided by CoScreen in terms of clarity and stability.

5. Security Features: CoScreen prioritizes security with end-to-encryption, access controls, and other advanced security measures to protect shared data and information. Join.me also offers security features but may not have the same level of comprehensive security measures as CoScreen.

6. Customization Options: CoScreen allows for extensive customization options, such as personalized workspaces, tailored settings, and customizable layouts, providing users with a tailored collaborative experience. Join.me, while customizable to some extent, may not offer the same level of flexibility and personalized options as CoScreen.

In Summary, CoScreen stands out for its advanced collaboration features, high interactivity, deep integrations, superior audio and video quality, robust security measures, and extensive customization options compared to Join.me.