I used PlantSnap a few times, but it never seemed to get things quite right. I'd take a picture of a plant, it would identify it, then I'd cross-check against google and it often wouldn't be quite right.
Tried this a few times in the garden centre at Bunnings - walk around, snap pics of plants, get the app to ID them, then cross-check against the label. About half the time it would get the right genus but not the right species. Still far from perfect at this point.