I have tried WebMD. I find it too overwhelming. The app is essentially a portal for their website. One has to be connected in order to use the app. Perhaps most uncomfortable aspect of the app is that, for every query, it provides "mountains of information". It is sometimes difficult to sort right information for me.
iTriage sounds depressing......
The recommended iHomeMD Pro is an interesting app. The authors designed the app to provide "straightforward" answer with concise description of the medical information. As Moon pointed out, the app provides a very useful direct drug-disease reference, which allows me to find the drugs of my interest quickly.