1. User Interface: Notable offers a clean and minimalist user interface, focusing on simplicity and ease of use, making it ideal for quick note-taking and markup. Restyaboard, on the other hand, provides a more comprehensive and customizable user interface with advanced project management features. Wekan offers a simple yet functional user interface that strikes a balance between usability and functionality.

2. Collaboration Features: Notable lacks advanced collaboration features such as real-time editing and commenting, which are essential for team collaboration. Restyaboard, on the other hand, excels in collaboration features offering real-time updates, task assignment, and discussion threads to enhance team productivity. Wekan also provides collaboration features like real-time updates and task assignment, making it suitable for team projects.

3. Integration Options: Notable has limited integration options with third-party apps and services, which can restrict its versatility in a workflow. Restyaboard provides more extensive integration options with popular tools like Google Drive, Dropbox, and Slack, enhancing its capabilities for seamless workflow management. Wekan also offers a decent range of integration options with tools like Zapier and Trello, facilitating enhanced workflow automation.

4. Mobile Accessibility: Notable has limited mobile accessibility options, which can be a drawback for users who require on-the-go access to their notes and marked-up content. Restyaboard offers dedicated mobile apps for iOS and Android, ensuring users can manage their projects and tasks efficiently from their mobile devices. Wekan also provides mobile apps for both iOS and Android platforms, allowing users to stay productive while away from their desktops.

5. Customization Abilities: Notable lacks extensive customization options, limiting users in tailoring the application to their specific workflow preferences. Restyaboard stands out in customization abilities, offering features like custom workflows, card templates, and board backgrounds for a personalized project management experience. Wekan provides moderate customization abilities allowing users to set up custom labels, swimlanes, and card covers to enhance the visual organization of tasks.

6. Security Features: Notable does not have advanced security features like two-factor authentication or encryption, which may pose a risk for users handling sensitive information. Restyaboard prioritizes security by offering features like SSL encryption, LDAP integration, and password policies to ensure data protection for users and organizations. Wekan also places an emphasis on security with options for SSL encryption and LDAP authentication, enhancing the safety of user data within the platform.

In Summary, Notable focuses on simplicity and ease of use, Restyaboard offers advanced project management features and collaboration tools, while Wekan strikes a balance between functionality and user-friendly design.