[IfOnlyYouKnew]

It is part of the operating system. You can either disable various power-saving measures. Or use the built-in shell command caffeinate. Or run a muted video looping in the background.

[utborin]

I’ve been confused about why this app even exists, for this very reason. I use the built-in facilities to keep my Mac awake.

[joegahona]

I’m guessing that doing command-line contortions is a hassle for some people, and this app removes that.

[bromonkey]

clicking one thing to get a functionality and having a visual status icon

[voodootrucker]

Thank you, I wasn't aware of these options.

As a teacher, I was often in situations where a lesson would go on for a while with no computer interaction, and another teacher recommended Amphetamine. It worked well and I never discovered the shell command. I actually tried for a bit and never discovered a GUI option. Do you have a link handy?

[X-Istence]

System Preferences -> Battery

Select either Battery or Power Adapter to make changes to how the system will go to sleep/turn the display off after a certain amount of time.

[smoldesu]

As opposed to KDE, where you click the battery icon and check off "keep my computer awake".

Sometimes Apple's design is so stuck in the 90s that I have a hard time wrapping my head around it.

[jitl]

You’re being downvoted for oversimplifying what this app does as well as the combative tone. As GP said, on Mac you can turn off sleep timer permanently in the OS settings. The app in question let’s you keep awake for the next N minutes/hours so the “keep awake” setting change isn’t permanent. It makes sleep-settings workflow much easier. It’s simple but worthwhile.