Meta's new AI assistant Muse launched in the US just two weeks ago and has already become the #1 downloaded app on the US App Store, surpassing ChatGPT. With 2.5 million cumulative downloads and 730,000 downloads in the first 5 days, Muse targets SMEs and individuals with task automation features (email, shopping, social selling) via a freemium model starting at $20/month. Meta's massive existing user base positions it competitively, though sustainability of this momentum remains uncertain.