Is Slack Down?

Yes, down for me, across multiple orgs.

Edit: now it's back, a handful of minutes later.

It's really slow for me, messages are coming in late.

Down here aswell. Seeing 500 error after app refresh.

Seems to be down.

It had been up for me, from Asia.

Good on my side. Eastern Canada.

Yep. App is down for us. Their website seems to be offline too (https://slack.com/)

Edit: aaaaaand we're back

Yep. Similar to the other day. Uploads failing. Messages not delivering. Status is obviously hand-updated.