Elon Musk's AI company, xAI, is testing a standalone iOS app for its chatbot, Grok.The app offers generative AI features like text rewriting, summarizing paragraphs, and generating images from text prompts.xAI is also preparing a dedicated website, Grok.com, to make the chatbot accessible on the web.Previously available only to X's paying subscribers, the chatbot was recently made free to all users.