If you like to use your iPhone to shoot video and Apple offered to upgrade your iPhone 5s from 1080p HD to 2k video for just $7, the decision wouldn’t require much thought. That’s exactly the trick Ultrakam has pulled off with its new iPhone app.

If you’re wondering how a mere app can convert your camera to a higher resolution, it doesn’t: it simply allows the software to use more of the hardware capabilities of your camera. Apple may say that your iPhone 5s has a 1080p HD videocamera, but that’s not quite true: the camera hardware itself is capable of anything up to 3264×2448, it’s just that the software can’t process that many pixels at a sensible frame-rate … 

With the built-in camera app able to capture HD video at up to 120fps, Ultrakam takes the opposite route, limiting the frame-rate to 30fps and using a more efficient codec to in order to capture 2k video: 2240×1672. The app also allows you to shoot at 24fps for a more film-like look.

Don’t expect to be shooting any blockbuster movies on your iPhone, however: 2k video consumes 3GB of storage per minute, so you’ll get less than 20 minutes’ footage even on a 64GB model with almost nothing else stored on it. The app is also limited to 20fps when run on the older iPhone 5.

But if you want to shoot high-quality short videos, the Ultrakam Professional Camera App is available for $6.99 from the iTunes store. If you have a second iPhone available to act as a remote, there’s also a separate remote-control app for $2.99.