Monday August 3, 2020


Some customers having difficulty loading the Slack app on iOS

Issue summary:
From 12:22 p.m. PDT on August 3, 2020 until 10:09 a.m. PDT on August 4, 2020, some iOS users were unable to load Slack. We determined this was caused by a change to how we handle dictionaries in our most recent iOS app update, which inadvertently led to performance issues for members of workspaces with very large custom emoji dictionaries. We released a change to how we manage emoji dictionaries, which cleared up the issue for all impacted users.

3:57 PM PST

Issues affecting the Slack app on iOS have now been resolved. If you are still running into trouble please follow these steps:

1. Quit Slack. 

2. Open the Settings app > Slack > toggle “Reset cache on next launch” to on.
3. Reopen Slack

3:48 PM PST

We've begun rolling out a fix that should address the loading issues for affected customers. We'll share another update once we're confident that this is resolved. If you're still experiencing this issue in the meantime, please drop us a note via or and we'll be on standby to assist.

12:03 AM PST

We're continuing to work with affected customers to troubleshoot the issue and develop a fix. We really appreciate your patience and will share more news shortly.

8:00 PM PST

Our team is continuing to investigate the cause of the loading issues. We don't have additional information to share at the moment but will be back in 30 minutes with another update.

7:25 PM PST

Some customers may be having difficulty loading the Slack app on iOS. Our team is investigating and we'll keep you posted as soon as we have more information. We're sorry for the disruption.

6:48 PM PST

Services affected