Fair enough, and I'm not trying to gate-keep, but your OP said "designing" (present tense) not "have designed" so hopefully you can see the confusion.
Personally, I'm leery of "hunting apps". There are quite a few of them out there, but I've never found one to be worth using. Apps seems to fall into three categories:
1. Apps that aren't "for" hunting but are still insanely useful. These seem to mostly be mapping apps like Caltopo, but weather, InReach pairing, and other functions are worth having too. I bet I have 8 apps that I've used "while hunting" that weren't "hunting apps" but I'm guessing you're not trying to compete with how I let my wife know I'm safely back at the truck at night, or my Kindle app when I'm reading for bed.
2. Apps that are "for" hunting and specifically focus on mapping. We all know OnX and Basemap but there are half a dozen other as well. This feels like a saturated space - and it doesn't sound like you're after this either.
3. The oddballs that focus on "non-mapping" stuff, like HuntStand, GoWild, HuntWise, etc. The thing is, at least to me, these either provide niche features like social networking (I would just post here) or wind tracking (yeah... never going to be accurate in Colorado) or they do a niche function (like a database of recorded elk calls). The former aren't things I think a lot of folks would use (but what do I know, I'm just some guy). The latter are very useful (thanks ElkNut!) but "done and dusted".
Mapping is popular because we hunt in a physical world. Unless you're going to magically produce hunt stats nobody else has gotten right before, I'm not really sure what an app that doesn't focus on mapping would really do. Maybe that's just me, but you asked...