Clubhouse launched on iOS in April 2020.[5] The app gained popularity in the early months of the COVID-19 pandemic—especially after a May 2020 $12 million Series A investment ($10 million in primary capital and a $2 million purchase of existing shares) from venture firm Andreessen Horowitz.[6][7] As of December 2020, the app had 600,000 registered users and remained accessible only by invitation.[4] In January 2021, the company announced that it would begin working on an Android application "soon".[8]