The Nike Running App is one of the most popular downloads for runners and general fitness enthusiasts for years. It has tens of millions of installs on Google Play and IOS. I’ve used it myself on occasion, I have the Nike+ sportswatch, and used the app if I forgot the watch.
Recently Nike decided to completely re-vamp the app saying that it was being designed “for runners, by runners” (I thought that only race directors had copyright on that phrase!). But the response hasn’t been good, and they’ve angered their large base of users.