Caffeine vs Mouse Jiggler: Which Keeps Slack Active Better?

The short answer: choose Caffeine if you want a free, tiny Windows utility that prevents sleep. Choose a hardware mouse jiggler if you cannot install software. But if the real goal is reliable Slack availability—not merely an awake computer—NotAway is the more direct solution because it runs in the cloud, follows a schedule, and covers up to seven Slack workspaces.

Slack says it normally marks you away after 10 minutes of desktop inactivity. That can happen while you are reading, presenting, writing on paper, or working in another application. Both tools try to supply the missing activity signal, but neither was designed specifically to keep Slack active.

Feature	Caffeine	Mouse jiggler	NotAway
Method	Simulated key event	Simulated mouse input	Cloud Slack connection
Price	Free	Varies; usually one-time	$3.99/month
Computer can be off	No	No	Yes
Slack-specific	No	No	Yes
Multiple workspaces	Not managed	Not managed	Up to 7

Keep Slack active during your working hours

NotAway keeps your Slack presence active on a schedule, so your status reflects when you're actually available.

Keep My Slack Active

How Caffeine Works

Zhorn Software's Caffeine is a small Windows tray utility. By default, it sends an F15 key-up event every 59 seconds so Windows believes the keyboard is still in use. You can pause it from the tray icon or configure timers, active periods, AC-power rules, CPU thresholds, and window-based activation with command-line options.

Caffeine is freeware, including for commercial use. That makes it difficult to beat when the requirement is simply “do not let this Windows PC lock.” Its developer also documents possible side effects: the simulated event can affect applications including PuTTY, PowerPoint, Google Docs, and Smartsheet. An alternative Windows sleep-prevention mode avoids the fake key event, but the developer notes that applications tracking user input will not see activity from that mode.

Caffeine pros

Free for personal and commercial use.
Tiny download with a simple tray control.
Timers and advanced command-line controls are available.
No cloud account or Slack credentials required.

Caffeine cons

Primarily a Windows utility; the separately linked Mac app is another product.
Your computer and relevant Slack client still need to be running.
It does not monitor individual Slack connections or token failures.
A simulated key can have unintended effects in other software.

How Mouse Jigglers Work

“Mouse jiggler” describes several products. Software jigglers move the pointer through an installed application. USB jigglers identify as an input device and generate cursor movement. Mechanical models sit under a real mouse and physically move its sensor, so nothing is connected to the work computer except the mouse you already use.

Hardware prices vary by model and retailer, so there is no single official market price. Basic devices are often inexpensive one-time purchases. Their appeal is simplicity: turn one on and the computer sees movement. Their limitation is equally simple: they operate at the device-input layer, not the Slack-workspace layer.

Mouse jiggler pros

A hardware model may require no software installation.
It can prevent inactivity in more than one desktop application.
There is usually no subscription or third-party account.

Mouse jiggler cons

The computer must remain powered on.
It provides no workspace dashboard, timezone schedule, or failure alert.
Software and USB models may be restricted on managed work devices.
Movement on a computer is not the same as a guaranteed Slack presence connection.

Which One Is Better for Slack?

Caffeine wins for a personal Windows machine that only needs to stay awake. A physical jiggler wins when installing an application is not possible and a simple local input signal is enough. Neither is a convincing solution for a freelancer or consultant juggling company, client, and community Slack accounts.

NotAway works at the level of the actual problem. You connect up to seven workspaces once, choose active days, hours, and timezone, and the cloud service maintains presence during that schedule. Your laptop can sleep or shut down. If a saved Slack connection stops working, NotAway records the sync error and emails you to refresh it.

The trade-off is straightforward: Caffeine and some jigglers are free or one-time purchases, while NotAway costs $3.99 per month and requires Slack session credentials to provide cloud presence. If you only need an awake screen, do not pay for more. If you need a dependable Slack green dot across multiple workspaces, NotAway removes the device juggling those tools leave behind.

Final Verdict

Choose Caffeine for free Windows sleep prevention and flexible local controls.
Choose a mouse jiggler for a simple physical or USB input solution.
Choose NotAway when Slack presence, multiple workspaces, cloud operation, and a real working-hours schedule are the requirements.