Slack: What Users Actually Complain About
Overview
The Slack mobile app suffers from significant stability issues with frequent crashes and authentication problems, while notification inconsistencies and sync failures create communication gaps. Users are particularly frustrated by the deteriorating user interface, especially on tablets, and the increasing number of bugs that affect core functionality.
Top complaints
1. App Crashes and Instability
cluster 1/7Frequent app crashes, unexpected sign-outs, and general reliability issues disrupt user experience.
“my app keeps crashing when I click on threads, I tried clearing cache, force stop .. nothing help”
“the app keeps stopping on me”
“Terrible app that crashes constantly, logs me out at random”
2. Notification Problems
cluster 2/7Inconsistent notification delivery, missed alerts, and issues with notification settings.
“Notification don't reach my mi band 4 device”
“bad notification handling in the DND mode”
“Notifications are hit or miss”
3. Login and Authentication Issues
cluster 3/7Difficult login processes, authentication failures, and sign-in problems prevent access to the app.
“The sign in process IS INFURIATIONGGGGG I couldn't even use the app!!!”
“Terrible login flow. Rarely works on mobile”
“Sign in broken Gmail option perpetually loads”
4. User Interface and Experience Problems
cluster 4/7Poor UI design, especially on tablets, confusing navigation, and cluttered interface affect usability.
“The UI is terrible for a Tablet. Once upon a time Slack had proper Tablet layout”
“very difficult to navigate UI...they took something that could be really simple”
“works fine but a recent change to show job titles makes the UI a cluttered mess”
5. Sync and Reliability Issues
cluster 5/7Messages failing to sync properly, missing content, and unreliable message delivery.
“missing messages and notifications. lengthy login process”
“bug filled unusable mess. Notifications are broken, messages don't send reliably”
“Often out of sync, reconnects forever, started conversations on desktop not visible in the app”
6. File Sharing and Technical Problems
cluster 6/7Issues with file sharing, connection problems, and various bugs affecting functionality.
“keeps failing to send images”
“unable to send a screen shot from an android mobile into a slack conversation”
“Huddle connection is pretty spotty”
7. Feature and Design Concerns
cluster 7/7Missing features, unwanted AI implementations, and design choices that frustrate users.
“Stop trying to shove your stupid bots down our throats”
“Want an ai summary of your search?? No. Want a ai summary of what happened today”
“There should be a split view on tablets, unfolded foldables”
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This page is rendered from the App Pain API — the same clusters, evidence quotes, and severity scores are available as JSON (or via MCP for AI agents) for any app on both stores.
Read the API docs Get a free API keyBuilt from public app-store reviews · not affiliated with Apple or Google · clusters are LLM-generated from real user quotes.