Work messaging service Slack has broken the 4m daily active users mark, having only passed the 3m milestone this May.
Launched in August 2013, Slack is a chat app for workplaces, centering around instant messages but with the ability to integrate a variety of third-party services including Google Drive, Dropbox, GitHub and Zendesk.
Its weekly active users now stand at 5.8m, and the service had 2.5m users connected simultaneously for the first time last month. North America is the single biggest territory for Slack adoption, followed by the UK, Japan and Germany.
Most important for a tiered service like Slack – which offers two premium monthly packages, priced at $8 and $15 per user – is the number of paying customers. After passing the 1m mark over the summer, the number of users subscribing to premium plans has grown to 1.25m.
“Continued momentum on the Slack platform is an important sign of the expanding role we play in the business software ecosystem,” reads the blog post announcing the milestone. “When we say 'Slack is where work happens,' we don’t just mean people sending messages to one another, but the integrated workflows, business processes, data streams and applications that spin the gears of work for tens of thousands of our business customers around the world.”