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How Does Slack Decide When You're Away?

Deep dive into Slack's presence detection system, explaining exactly how and when your status changes from active to away.

Sieun
December 1, 2025
December 10, 2025
5 min read
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Slack's presence detection can seem unpredictable. Here's what we understand about how it might work.

Basic Patterns We've Observed

Desktop: Appears to go idle after ~10 minutes without interaction

Mobile: Seems to show active only when app is open

Web: May behave differently than desktop app

Multiple devices: Recent activity typically takes priority

What Slack Likely Tracks

Based on user reports:

  • • Clicks and typing within Slack
  • • Scrolling in conversations
  • • Possibly WebSocket heartbeat signals
  • Slack probably doesn't monitor activity outside its app.

    Common Issues Users Report

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  • • Status not matching actual activity
  • • Different status on different devices
  • • Delays in status updates
  • Privacy Considerations

    Workspace admins may be able to see:

  • • Active vs away time (aggregated)
  • • General activity patterns
  • They likely cannot see specific keystrokes or screen content.

    These are observations from user experience—actual behavior may vary by workspace.

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      How Slack Decides Your Away Status - Technical Explanation