Slackgreen.com vs Amphetamine: Cloud Slack Presence or a Free Mac Utility?

The short answer: Amphetamine is the better free tool for preventing a Mac from sleeping. Slackgreen.com is more relevant if you want Slack availability from a remote service. NotAway is the stronger managed option for people who need a clear dashboard, up to seven workspaces, scheduled cloud operation, and connection-failure alerts for $3.99 per month.

Despite appearing in the same search results, these products do different jobs. Amphetamine controls macOS power and idle behavior. Slackgreen.com describes a chatbot that maintains Slack availability even when the client is off. This comparison separates system wakefulness from the ability to keep Slack active.

Feature	Slackgreen.com	Amphetamine	NotAway
Primary purpose	Slack availability	Keep a Mac awake	Slack availability
Price	$59 lifetime offer	Free	$3.99/month
Computer can be off	Site says yes	No	Yes
Schedule	Yes	Local triggers	Yes
Documented workspace limit	Not stated publicly	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

What Slackgreen.com Offers

Slackgreen.com says its chatbot keeps your Slack status green whether the Slack client is on or off. Its public page advertises a flexible schedule and timezone, no browser extension running on your computer, and a monthly report showing how long the service was online under your account.

The advertised price at the time of this review is a $59 lifetime deal with a seven-day refund window. That is attractive compared with a recurring subscription: after roughly fifteen months, $59 is less than paying NotAway's $3.99 monthly rate for the same period.

Slackgreen.com pros

Targets Slack rather than general computer activity.
Advertises operation when the local Slack client is off.
Includes schedule and timezone controls.
A lifetime price can be cheaper than a subscription over time.

Slackgreen.com cons

The public product page does not state how many workspaces one purchase supports.
The setup, connection-health, and credential-refresh experience is not documented in much detail.
The site makes strong career claims that are difficult for any presence tool to substantiate.
A lifetime deal depends on the service continuing to operate; its terms allow modification or discontinuation.

What Amphetamine Offers

Amphetamine is a polished macOS keep-awake utility. It can keep the Mac, display, or drives awake indefinitely, for a duration, until a chosen time, while a file downloads, or while an application runs. It can also move the cursor periodically.

Its trigger system is unusually capable. Sessions can respond to an application, Wi-Fi network, IP address, VPN, external display, power adapter, battery level, connected USB or Bluetooth device, mounted volume, audio output, or CPU usage. According to its Mac App Store listing, it is free, has no advertisements or paid tier, and does not track or harvest data.

Amphetamine pros

Free with no in-app purchases.
Excellent local automation and trigger options.
Useful for downloads, rendering, presentations, and other non-Slack tasks.
No cloud account or Slack credentials required.

Amphetamine cons

Only available for macOS.
The Mac has to remain on for local cursor movement or wake controls to work.
It does not connect, monitor, or report on individual Slack workspaces.
Its main purpose is system wakefulness, not guaranteed Slack availability.

Which Product Wins?

Amphetamine wins decisively for keeping a Mac awake. It is free, powerful, local, and useful in many situations unrelated to Slack. Paying for a cloud service merely to prevent macOS sleep would make little sense.

Slackgreen.com wins over Amphetamine when the requirement is direct Slack presence and the computer should be allowed to turn off. Its lifetime price is also appealing. The uncertainty is product transparency: its public pages do not clearly document a workspace limit or the same connection health workflow visible in NotAway.

Where NotAway Is the Better Fit

NotAway combines the useful part of a cloud Slack service with explicit multi-workspace management. One $3.99 monthly subscription covers up to seven Slack workspaces. A timezone-aware weekly schedule controls when all connected workspaces can stay active, while the dashboard shows each connection's state.

NotAway also treats failed credentials as an operational problem instead of leaving you to discover a gray dot later. When a workspace sync fails, it records the error and emails you to refresh the connection. That makes the Slack green dot easier to trust across client accounts.

NotAway is not the cheapest option over every time horizon, and it requires securely stored Slack session credentials. Amphetamine is free, while Slackgreen.com's current lifetime price can cost less after long-term use. NotAway's advantage is the documented package: seven workspaces, managed cloud operation, schedule, status dashboard, and failure notification at a low monthly entry cost.

Final Verdict

Choose Amphetamine if you use a Mac and need a first-class free keep-awake utility.
Consider Slackgreen.com if its lifetime deal and documented Slack schedule meet your needs.
Choose NotAway for transparent multi-workspace limits, cloud scheduling, connection status, and refresh alerts.