Amphetamine

Amphetamine is a little app that lives in your menu bar and helps keep your Mac awake. Through on demand sessions of either a timed or infinite duration, or Triggers which automatically keep your Mac awake, Amphetamine is the most powerful, most customizable, yet still easy-to-use, keep-awake utility for macOS!

As an added bonus, Amphetamine can also keep your connected drives awake.

As an extra-special added bonus, Amphetamine is 100% free, has no ads, no in-app purchases, no tracking, and no data harvesting!

Amphetamine can keep your Mac awake:
• Indefinitely, or for a specified amount of time
• While a file is downloading
• When an external display is connected
• When a USB or Bluetooth device is connected
• On a schedule
• While a specific app is running
• While a specific app is running and frontmost
• While your battery is charging and/or when the battery is above a threshold
• When your Mac has a specific IP address
• When your Mac is on a specific WiFi network
• When headphones or another output is in use
• When a specific drive or volume is mounted

Additional Notable Features:
• AppleScript support
• Create your own menu bar icons
• Define the Drive Alive wake interval
• Allow your display to sleep while keeping your Mac awake
• Allow screen saver to run after period of inactivity
• 12hr/24hr session time remaining display
• Auto-end session if your Mac's battery is low
• Hot key support for starting/ending sessions

Amphetamine requires macOS 10.10 Yosemite or higher
Amphetamine supports Retina displays and macOS dark mode.