This app is carefully designed to expedite casual encounters for people only seeking this. I have two suggestions I believe would improve the app and promote its growth:
(1) Reduce the cost, or at least provide a way for users to continue using it for free past the initial trial period, but perhaps with limitations compared to paying users.
(2) To make the experience more genuine, disable the ability to use saved photos on your phone. Only allow current photos, that must be snapped during a request and that disappear after the hour. Also implement face/body detection if possible; if no person is detected in the photo, the request should not be honored. This ensures youre getting what youre seeing - no catfishes, touched-up photos, images of inanimate objects, or former models using a pic before they became morbidly obese. As the pic is temporary Im guessing it may also save a bit of storage. The photo of course can be reviewed by the user and retaken if desired before submitting.
(3) Enable a way to switch whether one is seeking men or women at the time. It makes sense for bisexuals and other LGBT members. This might also help to attract more users.
I wont suggest adding too many options/features as I think the apps simplicity is part of its appeal and utility.
connorhawke.com about PURE: Anonymous Dating App, v1.3.79