8,000 customers signed up for the service within 24 hours of its launch in August 2013.[14][50] In February 2015, the company reported that approximately 10,000 new daily active users had signed up each week, and had more than 135,000 paying customers spread across 60,000 teams.[51][52] By April 2015, those numbers had grown to 200,000 paid subscribers and a total of 750,000 daily active users.[53] Late in 2015, Slack passed more than a million daily active users.[54][55] As of May 2018[update], Slack had over 8 million daily users, 3 million of whom had paid accounts.[56] At the time of its S-1 filing for IPO, dated April 26, 2019, Slack reported more than 10 million daily active users from more than 600,000 organizations, located in more than 150 countries.[57]