Sensor Tower data indicates that Meta's Threads in July 2023 was the most recent app before Muse to hit 10 million U.S. downloads in 40 days.

From the articleMeta’s Muse hits 10M US downloads in 40 days, a milestone reached by only 11 other appsAlso in Meta’s Muse reaches 10 million U.S. downloads in 40 days, a milestone matched by just 11 other apps | Межа