Grammarly: AI Writing Keyboard

Grammarly is an AI-powered writing assistant available as a keyboard for mobile devices and a Safari extension. It provides real-time feedback on spelling, grammar, conciseness, and tone, and offers generative AI rewrites for messages. It also includes a document editor with comprehensive writing feedback and plagiarism detection.

Grammarly's AI Writing Keyboard offers real-time writing feedback and AI assistance directly within apps, aligning with the 'guided-tool-interface' by providing suggestions for spelling, grammar, conciseness, and tone. It also offers 'creative-presets-and-styles' through tone transformations and different versions of messages. The app clearly has 'user-auth-and-subscriptions' with free and premium tiers, and it is a 'mobile-responsive-design' as it's an iOS app for iPhone and iPad. However, it doesn't explicitly mention a 'tool-catalog-and-categories' with 150+ tools or 'multi-model-integration' across various AI models, as its primary focus is on writing assistance.