This app is very useful for anyone who works with trees, or owns trees. It is extremely easy to use, with minimal clicking around needed to find things. The photos are excellent, and clearly illustrate symptoms. Best option is that the app is set up to easily allow the user to save or share the photos with others by email.
This app is a Must Have for arborists, landscapers, garden centers, and Master Gardeners. Extension agents/educators would find this a handy tool. Landowners with numerous landscape or woodlot trees would benefit from having this app. Can be used out in the wild where cell signals don't exist, although you'll need to wait until you get back to civilization to reach the provided links.
Highly recommended.