Slack appeared to be down on Wednesday night as users across the UK, the US and Australia reported problems with the work and communication platform a little before 11.30pm local time. The outage reports pointed to trouble sending messages and attaching files, with one user saying on Downdetector: “Currently getting 'Couldn't send message' when I attempt to attach a screenshot to a message in Slack. My colleagues are also having this issue.”
By shortly before 11.45pm, at least 36 UK-based reports of an issue with Slack had been logged on Downdetector, the real-time technology monitoring service. The platform was being monitored as an ongoing story, with updates expected as more users checked in from different time zones and the scope of the disruption became clearer.
The timing mattered because the complaints arrived late in the evening across several major markets at once, suggesting the disruption was not confined to a single country or office network. Slack is widely used as a workplace communication tool, so even a brief outage can stall conversations, file sharing and message delivery for teams that rely on it to keep work moving.
That said, the reports available late Wednesday still came from users rather than an official explanation, and the scale of the problem was measured by a monitoring service rather than by Slack itself. The gap between what users were seeing and what had been publicly confirmed left the central question unchanged: whether this was a short-lived glitch or a broader service issue that would spread further before it was fixed.
For readers tracking the disruption, the live update remains the link to watch: Is Slack Down? Users Report Outage Across the United States.
