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Peek-a-Boo ST is a utility to monitor and manage processes, has been described by one long-time user as "the utility I didn't realize I needed, until I'd used it."

Peek-a-Boo focuses on two things: clarity and flexibility. From the moment you first launch Peek-a-Boo, it will be clear what is happening with processes on your Mac.

Use Peek-a-Boo to twirl into process-comprehension nirvana.

Peek-a-Boo is the only utility of its kind to show process information for all types of processes: Classic applications, Darwin processes, and OS X native applications.

What's New

Version 2.9.3:
  • Stability fixes
  • Improved Process List sorting


  • OS X 10.6 or later

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Peek-a-Boo ST User Discussion

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Widber Member IconComment+9

Very nice program but the "Process Throb"-Window is not optimized for retina and display a mess. Please update this feature!

Reply0 replies
Version 2.9.2
tvalleau Member IconReview+104

What?!! All those comments and no stars ratings? Pish-tosh, I say! I've been using this for years now, and I love it. And the Process Throb window is not to be "Pish-Toshed" away: read the description of what it is doing, and you'll see that you can gain valuable insights with it. The Process information window is great, and it shows associated files along with it.

To those who say "..yeah, but... activity monitor" I'm bot to respond "text edit... yeah but Word."

If you're into the internals of what's-happening-now, I can't think of a better app.

and therefore: 5 stars... finally! :-)

Reply0 replies
Version 2.8.3
Bsoplinger Member IconComment-1

Its nice I guess to see a picture/graphical representation of CPU usage. Personally I like the combo of Memory Cell for individual program info and iStat menus for overall info (although MenuMeters would work for this also). These sit on the menu bar which is where I like info to be, accessible at any time without needing to find a program window.

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Version 2.7.6
Richard-Hallas Member IconComment+65

It's a very nice utility, but why the change of icon? I really liked the old one, derived from the Mac OS 'face' logo, and it made it clear what the utility was for. The new icon is awful, though! Not only does it convey a lot less (the Mac OS connection has been lost), but I dislike the blue-green colour scheme and the face on the top looks like an evil Halloween pumpkin. Ugh! Has Apple kicked up a fuss about adapting the Mac OS face for use here? If not, I'd like to see the old icon brought back, as it was miles better than the ugly new monstrosity. I see no reason for the change, and it's certainly not an improvement in any obvious way.

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Version 2.7.5
Lee123 Member IconComment+211

This seems to be a very useful app. Already in the first five minutes of use i have compared the memory usage of launchbar, butler and quicksilver. Very nice and should be used by all developers.

Reply2 replies
Version 2.6.9

opps, I mean cpu usage not memory.


Save yourself $20 and use Activity Monitor.app. It's in your Utilities folder.

DarylF2 Member IconComment+15

Peek-a-Boo 2.6.5 doesn't work at all for me... I run it and it just beachballs...

This is on a Mac Pro 3.0GHz Quad Xeon with 4GB RAM running Mac OS X 10.4.9.

Reply1 reply
Version 2.6.5

I figured it out... I add the 'ƒ' (option-f) character to my folder names (an old convention from my Mac OS System 4.2 days...). Apparently, Peek-a-Boo doesn't properly support Unicode paths. Changing 'ƒ' to "folder" fixes the beachball problem.

MacTX (Developer) Member IconDev+3
MacTX (Developer)

Ishan, a note from the developer...

Sorry to hear about the overzealous nagging you're seeing.

For a full description of the nagging issue with some suggestions, see:


My first suggestion would be to verify that you're using Peek-a-Boo 2.6 or later by checking the "About Peek-a-Boo" menu item. (If you accidentally run an older version of Peek-a-Boo, you may see the overzealous nagging that you've described.)

These occasional reports of overzealous nagging are a thorn in our side, because we've had trouble reproducing the problem. If you see it again could you drop us a note at:



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Version 2.6.2
ishan Member IconComment+20

This is a rather attractive alternative to Process Viewer, but...the constant "PAY" in 192 point type which completely obscures the window is simply put, obnoxious. And to make matters worse, their web page feedback mechanism is broken. Would it be that much to ask to have an unrestricted 14-day trial period before the application has to be purchased to be used? Why alienate potential customers with nag messages which destroy the entire flow of a well-crafted interface? $20 is not a lot of money, but I'm not spending it on an app which I can't even use for a minute or two without being interrupted by a nag screen which obscures the data that I need to use while working on software.

Ishan Bhattacharya, MD

Reply0 replies
Version 2.6.2
Tuishimi Member IconComment+46

This reminds me (at least in appearance) of the ProcessController application on BeOS. Does it run in the menubar, out of the way until you need it?

Reply0 replies
Version 2.5.5
Anonymous Member IconReview

*shrug* it's nothing you can't see or do in terminal pretty easily.

Reply1 reply
Version 2.2.1
Anonymous Member Icon

While I disagree with the pricing, I also have to wonder what someone like you (The Terminal commenter) is doing here since, in most cases, almost all 3rd party software relies upon SOME portion of the system to run!

The point being that most 3rd party software strives to introduce either new functionality from the system's functionality, or improve either existing system functionality, improve access to that functionality, or both.

So, are you here to give Terminal lessons, or are you just a closet 3rd party software junky?

user icon-13
Version 2.9.1
> 5 2


Current Version (2.x)


Downloads 24,914
Version Downloads 284
Type Utilities / System
License Shareware
Date 14 Jul 2014
Platform Intel 64 / OS X
Price $19.95
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