The absolute best free anti-screensaver and keep-awake applications for cross-platform users are Amphetamine (for macOS) and Microsoft PowerToys Awake or Caffeine (for Windows). These utilities simulate minimal user activity or toggle system flags to block screensavers, display dimming, and sleep timeouts without modifying core system preferences. Top Anti-Screensaver Software for Mac
Amphetamine: Widely considered the gold-standard utility on the Mac App Store. It is 100% free with no ads or tracking. It offers advanced “Triggers” to keep the Mac awake only when connected to a specific Wi-Fi network, a specific USB device, or while certain apps are running.
Caffeine (macOS): A legendary, minimalist menu bar icon of a coffee cup. Clicking the cup fills it to keep the Mac awake indefinitely; clicking it again empties it to let standard energy savings resume.
Lungo: A modern, sleek alternative to Caffeine that supports dark mode and allows you to set predefined sleep-blocking timers (e.g., stay awake for 10 minutes, 1 hour, etc.) right from the menu bar. Top Anti-Screensaver Software for Windows Amphetamine – App Store
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