Cueli is a versatile AI tool that can be accessed through both desktop and Slack applications. It provides a range of helpful features including grammar and spelling checks, tone analysis, and text summarization. In addition, users can utilize Cueli to search for industry-specific information, compose replies or reports, and seek advice for any challenges they may encounter. With its cross-platform functionality, Cueli ensures a seamless user experience across different devices. It offers a free version with 10m tokens, and users have the option to upgrade to a paid version for access to additional features.