Meta's Muse AI Agent Dominates App Store Charts Despite Reliability Concerns

Meta's new personal AI agent, Muse, has claimed the top spot on the US iPhone App Store just days after its September 8 launch, surpassing OpenAI's ChatGPT and accumulating over 2.5 million downloads—a striking endorsement of the shift toward agentic AI systems that take action across users' digital lives. Powered by Muse Spark, Meta's multimodal reasoning model introduced in April, the agent operates within a dedicated encrypted virtual machine and can handle multi-step tasks: booking flights through partnerships with Expedia and PayPal, composing emails, filling out forms, organizing inboxes, comparing prices, and monitoring promotional deals. Free access comes with usage limits; paid subscriptions start at $20 per month for heavier users and $100 per month for power users. The service is rolling out across iOS, Android, muse.ai, and Mac as of September 18, 2026, initially in the United States.