I’ve spent my Thursday nights over the past couple weeks enjoying the mild North Carolina autumn on a friend’s porch. A group of us get together, drink whiskey, and play guitar. It’s a good time, and though our musical tastes span a wide variety of genres, we can usually keep up with one another. There are those rare instances, though, where I’m glad to have an iPhone. I can dig up lyrics and tabs on the go. There’s just one problem: where do I put the phone? With the well-documented fragility of the iPhone’s glass, I don’t want to accidentally drop it on a cement porch.

Enter Castiv’s Guitar Sidekick. It’s a slick little gadget designed with this very problem in mind. The Guitar Sidekick consists of a rubber lined clip that grips your strings between the nut and the tuners and provides a cradle for your phone. The cradle is basically a spring-loaded claw with rubberized grips to keep your phone in place. It sounds tenuous, and trust me, it looks tenuous. That’s why I tested it over my bed before taking it for a porch session. I was shocked that it held so well, though if you’re really nervous about stability, just use a case along with the Castiv. The Apple Bumper, for instance, made the grip a rubber to rubber connection. My phone wasn’t going anywhere.

My only real complaint about the Guitar Sidekick is that it can be difficult to get the angle just right. It can be tough to secure a tight lock for the claw part of the device and adjust it to the right angle. It’s not impossible, just a nuisance. The good news is that you can secure a tight lock, which is probably of greater concern.

All in all, I think the Castiv Guitar Sidekick will be great for anyone looking to pick up songs quickly at an impromptu jam session. It’s application will be a little limited elsewhere, at least until there is a wide offering of apps across several mobile platforms.