Slack: What Users Actually Complain About
Overview
The Slack mobile app suffers from critical login and authentication issues, frequent crashes and performance problems, along with notification failures and sync issues. Users also report significant UI/UX problems, compatibility limitations, and difficulties with file sharing and communication features.
Top complaints
1. Login and Authentication Issues
cluster 1/6Users experience significant difficulties with login processes, authentication failures, and account management.
“recent update has caused slack to have a bug that doesn't log you in, every time I log in with Google it keeps spinning”
“does not let me sign in Uninstalled and reinstalled multiple times”
“log in flow is impossible. needs both email and phone 2fa and then says ive tried too much”
2. Performance and Stability Issues
cluster 2/6The app frequently crashes, freezes, and experiences performance problems across various devices.
“Very buggy. Need a call”
“freezing phone, Bluetooth audio does not work.”
“constant crash in pixel 10 pro”
3. Notification and Sync Problems
cluster 3/6Users report notification failures, sync issues between devices, and missed messages.
“Notification don't reach my mi band 4 device... Also cannot see the codeblock in dark theme”
“too bad notification delivery, it doesn't sends me notification when someone messages me.”
“the sync between desktop and mobile is the worst. i pick up phone calls on the computer and my phone keeps ringing”
4. UI/UX and Usability Concerns
cluster 4/6The app has navigation problems, poor tablet support, and confusing interface elements.
“still not optimized for foldables & tablets. now that you've done it for the ipjone duo please get your asses up”
“Long-pressing on a message brings up a pop-up, but tapping the back button doesn't close it”
“it's difficult to navigate back and forth between different conversations”
5. Compatibility and Feature Limitations
cluster 5/6The app has compatibility issues with certain devices and lacks desired features for optimal experience.
“you need to make it compatible with android earlier versions from at least android 9 or 8”
“sluggish, bad call quality.”
“No longer works with biometrics. keeps prompting for biometrics even after reinstall”
6. File Sharing and Communication Problems
cluster 6/6Users experience difficulties with media sharing, message reliability, and communication features.
“Huddle connection is pretty spotty”
“Huddle connection is pretty spotty”
“bug filled unusable mess. Notifications are broken, messages don't send reliably”
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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 key — 20 analyses to startBuilt from public app-store reviews · not affiliated with Apple or Google · clusters are LLM-generated from real user quotes.