On more than one occasion, I have taken photos of a fantastic macro subject only to realize I didn’t know it’s identity. Then I discovered the Seek App by iNaturalist (available on Google Play and the App store). As long as I have my phone with me, I snap a photo of the subject and load it into the app. In a few seconds the app gives me the identity. If I’m without cell service, I still take the photo and load it into the app later.
The below screen shots demonstrate how easily the app works. The image on the left is after loading a photo from my camera roll. The image on the right is the result. This is a very powerful free app. I use it wherever I go to quiz myself of plant species. Give it a try.