Hello -- I am the developer of the Mt. Whitney Guide app for Android. It will be available for iPhone shortly.
My main business is developing apps for long distance trails, but I thought some people might enjoy an app for the Mt. Whitney Trail. I can understand the criticism that I read (I hiked the entire Pacific Crest Trail last year, so I can relate to annoyance with "real world" gadgetry in the trail world). My idea with this app is that some people might find it helpful for these reasons:
(1) first timers who would like a pre-view before arriving (the app has photos and descriptions of over 40 waypoints along the trail),
(2) hikers who are nervous that they are not on the trail, particularly during parts of the year when the snow hasn't melted (depending on the year, this can be a significant issue, especially if you are not familiar with the trail), and
(3) hikers who simply want to see where they are on the trail while taking a break.
I hope that the app is useful and I would love any feedback. For the JMT hikers out there, we will release the JMT version in the coming months. We already have a line of apps for the PCT called "Guthook's Guides" for iPhone. They were introduced last year and very popular on the trail. A new version is coming out in the coming days and the Android version will be rolled out in the next month or two.
Happy hiking!
--Alice
P.S. just won a lottery spot for the Whitney Trail in June - so excited to get back out there!