Slack Desktop App vs Browser: Memory, Notifications and Presence

The Slack desktop app is better if you want notifications without a tab open, offline reading of conversations you already opened, and every keyboard shortcut and slash command. Slack in a browser is better if you cannot install apps, keep your browser open all day, or want less extra memory, since a tab shares the browser's processes. Presence differs: the desktop app counts input anywhere on the computer and sets you away after 10 minutes without it (Slack desktop 4.52.178 code, checked 7 Oct 2026), while a browser tab cannot see other apps. The browser adds one risk: memory-saving features can discard a background Slack tab, which ends that session.

Slack desktop app vs browser compared

Slack desktop vs web memory

The desktop app is Electron, a bundled Chromium browser, so it runs its own set of processes. A tab in a browser you already have open adds only the Slack page itself. If you keep Chrome or Edge open all day, the tab usually costs less extra memory; if you would open a browser only for Slack, the difference shrinks. For scale: on our M2 Max Mac on 7 October 2026, the desktop app (4.52.171, open about 21 hours, one workspace) used 909 MB in Activity Monitor terms, 432 MB of it in the renderer that holds the web app and 342 MB in its own GPU process. A Slack tab needs roughly the renderer part, since the browser's GPU and network processes already run. The per-process numbers are in what Slack used on our Mac. Ways to cut Slack's memory in either are in why Slack uses so much memory.

Notifications, offline and shortcuts

• • Notifications. The app sends native notifications even when its window is closed to the tray or menu bar. A tab needs to stay open and needs the browser's notification permission.
• • Offline. The desktop app can open without a connection and show conversations you already read; see does Slack work without internet.
• • Shortcuts. Some keyboard shortcuts and slash commands work only in the desktop app, such as opening Threads with Cmd/Ctrl+Shift+T; see the shortcuts cheat sheet and slash commands list.

Slack web vs desktop presence

The desktop app reads the computer's idle time every 10 seconds, so input in any app keeps you active; it sets you away 10 minutes after the last input, or at once when the computer sleeps or locks. A browser tab cannot read the computer's idle time. We do not state a browser rule: our test tab on 7 October 2026 stayed active for 30 minutes with no input. Two more browser differences:

• Tab discarding. Chrome's Memory Saver, Edge's sleeping tabs and similar features can unload a background Slack tab. An unloaded tab has no session, so it cannot keep you green. Add app.slack.com to the browser's always-active list.

• Cookies. Clearing cookies on exit signs you out of Slack in that browser; see Slack keeps logging me out.

The browser-specific rules are in keep Slack active in the browser, and the desktop ones in how to keep Slack always active on desktop.

Slack web app keeps going away

If Slack in a tab shows you away while you work, check in order: the tab being discarded, the computer sleeping or locking, and a dropped connection. The full diagnosis is in why Slack keeps showing you as away.

Which one to use

• Desktop app if you want notifications with no tab open, use huddles a lot, want every shortcut, or work offline sometimes.

• Browser if you cannot install apps, live in your browser, or switch computers often.

You can use both. Slack shows you active if either one counts as active. If links keep opening the wrong one, see Slack keeps opening in the browser. To stop the app launching with your computer, see how to stop Slack from opening on startup.

FAQ

Is Slack better in the browser or the app?

The app for notifications, offline reading and shortcuts. The browser for no install and less extra memory.

Does Slack in a browser keep me active?

While the tab is open and connected; our test tab stayed active for 30 minutes with no input. A discarded tab ends the session.

Can I use the Slack app and browser at the same time?

Yes. Your dot is green if either one counts as active.

Why does Slack in Chrome keep going away?

The 10-minute rule, or Chrome's Memory Saver unloading the tab. Add app.slack.com to the always-active sites.