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Slack: What Users Actually Complain About

Slack Technologies, Inc. · Business · iOS · App Store 4.1★ · 54,203 ratings

296 reviews analyzed 178 negative (≤3★) 7 pain clusters updated Oct 18, 2026

Overview

The most significant pain points revolve around notification reliability, UI/UX frustrations, and mobile app limitations. Users are particularly frustrated with inconsistent notifications that cause them to miss important messages, and recent UI changes that have made the app less intuitive. Performance issues and syncing problems between devices further compound these frustrations.

Top complaints

1. Notification Issues

cluster 1/7
18% of complaints●●●●○ sev 4/542 reviews

Users report unreliable notifications that either don't appear, are too quiet, or show incorrect unread message counts.

“The app is constantly telling me I have at least 6 new notifications but when I open and check all my mentions channels”
“Notifications are so quiet that even on full volume, I almost never hear them, which makes this app nearly useless.”
“notifications don't work reliably, I miss important messages despite having them enabled”

2. UI/UX Problems

cluster 2/7
15% of complaints●●●○○ sev 3/527 reviews

Users find the interface cluttered, unintuitive, and inconsistent with recent updates causing navigation difficulties.

“new UI is less intuitive, requires swiping through more pages to find channels”
“The latest update is terrible. All of my channels from many different workspaces across the same enterprise plan are mix”
“the app feels like a sloppily constructed web wrapper”

3. Mobile App Limitations

cluster 3/7
12% of complaints●●●●○ sev 4/521 reviews

Users experience performance issues, syncing problems, and missing functionality when using the mobile app.

“hours of messages will disappear in public channels and just...... never show up again”
“Mobile Slack worked fine for me for years, until the last 3 months or so - now, I pretty much exclusively use the deskto”
“mobile website experience is nightmare, stuck in perpetual loop for basic tasks”

4. Syncing Issues

cluster 4/7
8% of complaints●●●●○ sev 4/514 reviews

Messages and notifications don't properly sync between mobile and desktop versions, causing confusion.

“Messages and whether a thread is read or unread do not sync 100% of the time. More like 40% of the time.”
“What is on desktop does not reflect in the app. This includes saved for Later, Reminders, Statuses of myself and others,”
“unread message syncing unreliable between mobile and desktop”

5. Message Organization

cluster 5/7
7% of complaints●●●○○ sev 3/512 reviews

Users struggle with finding and organizing messages, with poor search functionality and cluttered channels.

“messages are all over the place, hard to track previous conversations”
“The UI is too cluttered, and it's easy to miss messages. Things get buried.”
“hard to find particular messages and it's not intuitive like other messaging platforms”

6. App Performance

cluster 6/7
6% of complaints●●●●● sev 5/511 reviews

Users experience crashes, freezing, and data loss when using the app, particularly during message composition.

“The app crashes while I'm typing a message and loses my work. I am forced to constantly restart the app”
“the app freezes on the most recent messages of the last channel”
“photo uploads to fail constantly when done in larger quantities”

7. Workspace Management

cluster 7/7
5% of complaints●●●○○ sev 3/59 reviews

Users find it difficult to manage multiple workspaces and organize channels effectively.

“viewing multiple workspaces is overcomplicated, hard to configure access”
“Everything starts off as a good intention but then people start piling on more and more channels”
“Channels can no longer be in a custom order, themes no longer have custom colors”

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