Meta's AI assistant hit 5 million US downloads in 22 days, lifted by its own ad spend
Muse topped the US charts faster than ChatGPT did, but the growth tracks Meta's own advertising; retention is unknown.
According to Sensor Tower, Meta's agentic AI assistant Muse passed 5 million US downloads on September 30, 22 days after launch, topping the App Store free chart for 12 consecutive days.
That is far faster than ChatGPT at 56 days, Grok at 103 days and Claude at 492 days. Sensor Tower counts only 23 US apps ever crossing 5 million downloads within 22 days; before Muse, the only non-game ones were Disney+, HBO Max and Threads.
The growth has a clear paid component: Meta ramped up advertising from September 16, lifting downloads 73% that day, and over the past two weeks Muse took up to 50% of Meta's own ad inventory, shrinking Facebook's and WhatsApp's share. The 5 million figure is a projection by Sensor Tower analyst Kara Lee; the firm's original report is not linked in the source.