I got an old iPad for free recently and noticed that the Amazing Slow Downer app for the iPad is $15 compared to $50 for a desktop. I bought it, and it works just as well as the desktop version. In fact, the iPad version will slow down stuff streaming from Spotify, which I have never been able to figure out how to do on the desktop version.
For regular computers not pads of any sort, check out VLC media player. It is a free universal media player. However it has the great ability to slow down and maintain pitch. And in case you’re wondering, yes it works great for videos. You can either load up a video you have on your computer (i.e downloaded or pull from youtube) or you can actually just paste a youtube url into the media player to load the video content of that page and then begin your slowdown process. This way you don’t actually even need to download the youtube video. You can set marks for looping as well.
I have gotten more out of amazing slow downer then just about anything else (not counting Tommy) and I won’t be replacing it, in fact it is basically as much a part of my practice routine as my guitar, but the video slow down feature of the VLC player is great as well.
Oh, and congrats on the ipad. Tommy pointed me to a great app a while ago called live pbm. Rather than your usual metronome, this listens to you playing and and traces a rolling graph of your BPM. You can watch live how even or leaning you are.