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I'd like to use my iSight camera to detect motion, and if any motion is detected, record a short movie (until the motion stops) for security purposes (ok, I want to spy on my cat).

Is there software available to do this? Free/open is preferable.

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I've used iAlertU before: takes a screenshot, not a movie, but it is free.

There is also SecuritySpy which does record movies but isn't free.

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+1 for the free stuff link – rraallvv Mar 28 '13 at 22:24

I am using witness app successfully for 3 months now. It's incredible. If you combine it with the iPhone app, you can even receive the alert when you are on a remote location.
The only bottleneck is that it costs something like 39 USD. But i would definitely recommend it, it works pretty well!

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up vote 1 down vote accepted

iCam looks like it will work.

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I think this answer is referring to the iCamSource application ( that can be used in conjunction with their iCam iOS and Android Apps. It looks like it does have motion detection, and looks very promising. – gavaletz Nov 26 '12 at 18:44

There is a Mac app called iSentry which does what you are asking. It requires a set schedule to work. It saves video or picture to a designated file on your computer and can send email alerts (which works well with the iPhone).

You have to be sure not to set the sensitivity too light, or something like a ceiling fan will constantly set it off.

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