This App presents a visually-based key to British and Irish plants (ferns, horsetails, and higher plants including grasses, sedges, other herbs, trees and shrubs). The key runs direct from visual-flora.org.uk. Note that even though this web version has rather low resolution initial images, it can run rather slowly on slow internet connections as it requires a lot of data transfer. Clicking on any image brings up a higher resolution version.
As an alternative the key can be run as a locally-downloaded App on Smartphones, Tablets or Computers, not requiring internet connection. Installation of the App requires nearly 3GB of free memory. Further details of access are available from firstname.lastname@example.org.