Meta’s Muse AI agent app has dominated the U.S. App Store free chart since mid-September, driving its 86.5% implied probability for the October 16 top spot. Launched September 8 as a personal agent that handles tasks like email, bookings, and purchases via connected accounts, Muse quickly displaced ChatGPT with strong early downloads and 4.9-star ratings from hundreds of thousands of users. Recent October 7 iPad support and added business connectors such as Asana, Canva, and QuickBooks have extended its momentum across Apple devices while Meta continues rapid updates. ChatGPT sits at 14.5% amid stable but lower visibility, with other apps trailing far behind due to lack of comparable AI-driven growth or chart surges. Traders see limited near-term catalysts that could unseat Muse before resolution.