I find myself using this often when I am away from home or other reference materials or if a friend has a question about a specific oil or condition that may be supported by oils. It is not as comprehensive as the books, but I find it easy to read and follow and great for the first go of information seeking. Does as I have hoped and expected. Essentially you click on an oil and it lists propteries, historical uses, common primary uses, common application methods, and safety data. If you click on a condition there is a brief definition of the condition and then a list (in order of suggested use) of oils to support said condition and brief advice on how to use them. It gives me what I need information wise and I find myself using this app weekly if not more often
MkeSLP about Modern Essentials, v7.0.5