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Slack: What Users Actually Complain About

Slack Technologies, Inc. · Business · iOS · App Store 4.1★ · 54,773 ratings

295 reviews analyzed 176 negative (≤3★) 7 pain clusters updated Oct 31, 2026

Overview

The primary pain points revolve around notification system failures, UI/UX design problems, and difficulties with message organization and discovery. App performance and stability issues, along with cross-platform inconsistencies, further contribute to user frustration.

Top complaints

1. Notification System Failures

cluster 1/7
28% of complaints●●●○○ sev 3/538 reviews

Users experience unreliable, inconsistent, and problematic notifications across devices.

“Notifications are terrible and unreliable”
“I only get message notifications half the time and I have confirmed multiple times that my notifications are turned on”
“constantly telling me that I have unread messages in channels I know I read”

2. UI/UX Design Problems

cluster 2/7
15% of complaints●●●○○ sev 3/520 reviews

The interface suffers from clutter, inconsistency, and confusing design choices.

“The UI is too cluttered, and it's easy to miss messages”
“Why did Slack remove the option to open Slack to the most recent conversation? It was previously standard”
“manages to make things even more complicated than they need to be”

3. Message Organization and Discovery

cluster 3/7
17% of complaints●●●○○ sev 3/523 reviews

Users struggle to find, organize, and track messages and conversations effectively.

“No longer easy to see all unread messages in one place”
“Channels quickly become cluttered and keeping track is a mess”
“Cannot find way to organize list of messages on iPhone. Hard to find recent messages”

4. App Performance and Stability

cluster 4/7
9% of complaints●●●●○ sev 4/513 reviews

The application suffers from crashes, freezing, and poor performance issues.

“The app crashes while I'm typing a message and loses my work”
“every single time I open the app, it freezes on the most recent messages of the last channel I viewed”
“performance on anything other than a perfect internet connection is terrible”

5. File Sharing and Technical Issues

cluster 5/7
6% of complaints●●●○○ sev 3/58 reviews

Users encounter problems with file uploads, media handling, and message delivery.

“Photo uploads to fail constantly when done in larger quantities”
“why my messages are not delivered? Probably slack mutes them”
“attaching files to list items almost never works”

6. Cross-Platform Inconsistencies

cluster 6/7
17% of complaints●●●○○ sev 3/524 reviews

Features and settings don't sync properly across different devices and platforms.

“Messages and whether a thread is read or unread do not sync”
“No longer supports the desktop or web app color themes”
“continued sync issues with the app from what is on desktop. What is on desktop does not reflect in the app”

7. Authentication and Workspace Management

cluster 7/7
4% of complaints●●●○○ sev 3/56 reviews

Users face difficulties with login processes and managing workspaces.

“Genuinely insane how difficult it is to log back in to your account”
“totally over complicated how to view multiple workspaces”

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