In the app you can choose a patient (useful for families and recordkeeping), optionally have a doctor virtually supervise the test, and then it walks you through the test. You can also view a history of all your prior tests.

Honestly, out of all the phone-connected medical devices I've used (most of which suck), Cue has been the best by far.

Agreed. The app stuff is nonsense. We have one of these and they could very well have used a small display or light patterns to indicate test progress and test results without a mobile phone.

It needs the phone's battery to hear up the reagents and sample. It's also not clear to me what processing is occurring within the cartridge and cue device.