So, yes there are apps. But, no, they are not reliable and should not be trusted. Maybe someday the AI will catch up to where we want it, but for now, it's a hard no. Now, of course, the app companies will tell you how amazing their identification skills are, and for many cases, they may “work” and give you an identification. But they are not trustworthy as a sole source of identification. You can use it to get you started and then use books to confirm. The problem with apps is that they can't smell, or feel, or use all the senses that we humans have at our disposal. And, in many cases, mushroom identification is so particular, smell is the sole discerning factor between species. Also, SO MANY species lookalike, and their growth can be distorted or unusual, which makes them hard to identify for even the most experienced. Not everything can be solved with AI, and mushrooms are strongly in the "no" group.