This sounds like it should have a simple answer.
If your computer is awake, Slack should stay active. Right?
Not quite.
Keeping your computer awake helps, but it is not always the same as keeping Slack availability active. These two things are related, but they are not identical. Annoying, yes. Surprising, not really. Computers do enjoy finding new ways to be pedantic.
Awake is not the same as active
When people say "keep my computer awake", they usually mean stopping the screen from sleeping, locking or dimming. That is useful.
If your Mac or Windows PC goes to sleep, Slack will not keep behaving like you are actively using it. So sleep prevention is a good first step.
But Slack availability is based on activity signals too. Slack's Help Centre says you are set to away after 10 minutes of desktop inactivity. On mobile, you can also be shown as away if you close the app or navigate away.
So your computer may be awake, but Slack may still decide there has not been enough activity.
That is the bit people bump into.
What keep-awake tools actually do
Keep-awake tools are designed to stop your computer sleeping.
On Mac, that might mean using a tool that keeps the system awake whilst you work.
On Windows, it might mean changing power settings or using something like a PowerToys Awake alternative.
These tools are useful if your laptop keeps locking during calls, long reads, demos or downloads. They stop your machine from taking a nap at the worst possible moment.
But they do not always create desktop activity. They may keep the lights on without touching the mouse or keyboard.
That matters if the app you care about is looking for activity, not just whether the machine is awake.
Why Slack can still show you as away
Imagine this.
You are reading a long document on your second screen. Your computer is awake. Slack is open. You are still at your desk.
But you have not clicked or typed for ten minutes.
From your point of view, you are working.
From Slack's point of view, things have gone quiet.
That is the gap.
A keep-awake app can stop sleep, but it may not stop the appearance of inactivity. If you want presence to reflect that you are still working, you may need both: the computer staying awake and some controlled desktop activity.
The common mistake
The common mistake is treating all idle problems as the same thing.
They are not.
A sleeping computer is one problem.
A locked screen is another.
Slack showing you as away is another.
Your status changing on mobile is another again.
A keep-awake setting may fix one of those without fixing the rest. That does not mean the tool is broken. It means the problem has more than one layer.
Very computer. Very rude.
What actually helps
Start with the simple stuff.
Check your Mac or Windows sleep settings. Make sure your computer is not locking too quickly during normal work. If sleep is your main issue, a tool that can keep your computer awake may be all you need.
Keep Slack open on desktop if Slack availability matters to you.
Avoid relying on mobile as your main signal, because mobile status can change when you leave the app.
If you are reading, watching, listening or working elsewhere for long periods, controlled desktop activity may help. That is also the cleanest way to prevent Slack going idle while you are genuinely working. It means activity happens in a screen area you choose, rather than random movement across your desktop.
The key word is controlled. You do not want anything clicking send buttons, changing settings, or poking around places it should not.
Where Green Dotter fits
Green Dotter includes a keep-awake option and controlled mouse click automation. So it can help with both parts of the problem: stopping your computer going quiet and creating activity in a defined area.
It is made for legitimate desktop automation, such as long reading sessions, calls, repetitive workflows, downloads, testing, and work in another app.
Use it in a way that follows your workplace policies and the rules of the tools you use.
Green Dotter is an independent tool and is not affiliated with, endorsed by, or sponsored by Slack Technologies, LLC, Salesforce, Microsoft, Apple, or any other third party.
FAQ
Does keeping my computer awake keep Slack active?
It can help, but it is not guaranteed. Keeping the computer awake stops sleep, but Slack availability can still depend on desktop activity.
Why does Slack go away when my laptop is awake?
Because awake and active are different. Your laptop may be on, but Slack may not see enough activity to keep you active.
Do keep-awake apps work with Slack?
They help with sleep and locking. They do not always create the activity signals Slack uses for availability.
What is the best fix?
For many people, the best setup is sleep prevention plus controlled desktop activity in a safe area.