Meta’s Muse hits 10M US downloads in 40 days, a milestone reached by only 11 other apps

The AI companion launched by Meta in September has amassed 10.9 million total downloads, with 10.2 million coming from the United States, according to Sensor Tower. The surge is driven by Meta’s cross‑promotion across its 3.6 billion‑user ecosystem and a steep rise in ad spend—39 % of the company’s total advertising budget in October versus 23 % the month before—propelling Muse to the 21st‑largest brand for U.S. ad impressions. Retention metrics reinforce the momentum: 30 % of U.S. users remain after a week and 23 % after two weeks, beating the 19 %/16 % averages recorded for ChatGPT, Claude and Grok. Daily active users hit 2.5 million on October 16, a 15 % week‑over‑week lift, and the app has dominated the U.S. App Store chart for virtually its entire run, briefly slipping only on October 19 before reclaiming the top spot; it also leads Google Play for the past month.

The achievement places Muse alongside a handful of mobile games—Fortnite, PUBG Mobile, Pokémon GO—and a few non‑gaming services like Threads and Disney+. Those precedents illustrate that massive early adoption typically hinges on existing network effects and heavy marketing, both of which Meta possesses in abundance. Compared with OpenAI’s ChatGPT, which recorded 3.7 million U.S. installs and 15 million worldwide in the same window, Muse’s numbers look modest globally but impressive domestically, especially given its current rollout limited to the U.S. and Canada. The contrast underscores how platform‑level reach can substitute for geographic breadth, while also hinting at a potential ceiling once Meta expands Muse beyond its current markets.

Looking ahead, the key risk is translating early hype into sustained engagement. While Muse’s 7‑ and 14‑day retention outperforms rivals, the drop‑off after the first two weeks remains significant, and the app must prove its utility beyond novelty to keep users active. Additionally, the heavy reliance on paid promotion could become costly if growth plateaus, prompting Meta to lean on organic network effects from its other apps. Watch for any expansion beyond North America, shifts in ad spend allocation, and whether retention improves as new features are added.