Buffer

Buffer is a social media management platform designed to help individuals and businesses plan, schedule, and publish content across various social media channels. It aims to streamline social media presence and engagement.

Buffer offers an AI Assistant with a social media post generator that uses a guided interface and allows users to select tones and styles, aligning with 'Guided Tool Interface' and 'Creative Presets & Styles'. It also has user authentication and subscription plans, matching 'User Authentication & Subscriptions'. The website is mobile-responsive, fulfilling 'Mobile Responsive Design'. However, it does not explicitly mention multi-model integration or a broad catalog of 150+ diverse AI tools beyond social media content, which are key 'must-have' features for the described concept.