It turns out there’s not an app for that.
From the Register 09/11/12:
An Arizona man concerned for the safety of his college-bound daughter has created a personal-protection device that she's sure to carry with her everywhere: an iPhone case that doubles as a pepper-spray shooter.
"Most [students] don't go anywhere without their smartphone," inventor Scott McPherson notes on the website of his company, Spraytect, "so the optimal solution was to combine her phone and a safety device."
If you say so, Scott.
Truth be told, McPherson did a rather slick job when designing the prosaically named Pepper Spray Phone Case, which comes in black, white, turqoise, (sic) and pink, and can deliver an eye-biting spray at a distance of six to eight feet.
Just less of a slick job when it came to naming it, then.
And if you think you might need some target practice with it, McPherson’s got that covered, too.
[It] helpfully includes a non-irritating test cartridge so that you can practice your draw, aim, and shoot skills without endangering your mates.
Being well prepared is a good thing, but I don’t think college students should be encouraged to go out on a date expecting to use their pepper spray. Shouldn’t it be reserved as a ‘last resort’ thing?
In addition to its personal protection raison d'être, the protruding cartridge housing also acts as a kickstand that "allows you to watch movies and videos keeping your phone upright without propping or holding it," the Spraytect website notes.
Users of a nervous disposition will no doubt watch movies with their trigger finger poised over the spray button. I wonder how long it’ll be before a horror movie they’re watching causes an inadvertent release of pepper spray and a resultant claim from an enraged (and innocent) fellow passenger they were sitting next to?
Sounds like a disaster waiting to happen to me. (Then again, I was always a pessimistic one).