This app was mentioned in 1 comment, with an average of 0.00 upvotes
I agree partially.
For me there is no difference between using a book and an app. Except the book is heavier than my phone.
There are apps, that do work. But I only found those for flower-gardens and weeds/pest-plants. (for example: https://play.google.com/store/apps/details?id=org.naturemobile.wildplantsfree)