For the low, low price of $325/mo. forever, you can be treated for depression!
A device should be "purchase once, use until it no longer functions." An app should be no more than $10/mo, and really it shouldn't need an app, or data connection, of any kind.
wired.com
A New Headset to Help With Depression Is Now Available in the US
The device made by Flow Neuroscience is approved by the FDA and could help people get off antidepressants—but it costs $2,200.