I am a prospective botanist from graz, currently in my second semester of the Master of plant sciences.
For my bachelor thesis I participated to the keytonature project, by creating an identification key for about 150 plant species one can find at the Ruinenberg Gösting, located in the north of Graz (my part was the identification and selection of the included species).
It is a simple tool to identify plants by looking at their phenotypical traits and comparing them to pictures and symbolic images shown in the application.
If you are interested you can download it with this link:
Apple: https://apps.apple.com/it/app/keytonature-guide-interattive-alla-biodiversit%C3%A0/id952337414

Android:
https://play.google.com/store/apps/details?id=com.divulgando.keytonature&hl=it

To download the key go to "online archive" and search for "Ruinen"