Recent download momentum and marketing pushes shape tight odds for the #2 free U.S. iPhone spot on October 9. Muse from Meta, the AI agent app launched September 8, has held the top rank since mid-September through rapid installs and Meta’s platform distribution, yet its sustained lead leaves #2 contested among Vinted’s resale marketplace surge, ChatGPT’s established user base, APTV’s climb, and Threads’ social engagement. Daily charts show frequent swaps driven by short-term download spikes rather than long-term retention, with AI agents and shopping apps competing for visibility ahead of any weekend promotional effects. Traders price the outcome near even because historical patterns indicate last-minute volatility can shift positions within days.