Matt Brian writing at The Next Web:

In our tests, I had mixed results. Initially, my iPhone continued to remain in range, meaning that if I was to walk around the office or different rooms in the house, my Mac remained awake and usable. However, if I went outside a range of around 10-15 meters, Keycard did its thing without an issue.

I’m not sure $6.99 is a viable price for 1.0 app whose developers are still perfecting activation range and that is suffering from “random screen locks when the device is still in range,” but it’s a neat concept. I’d find it especially useful in an Apple-focused office environment or a co-working space. Here’s a direct link to the iTunes store if you want to check it out.