The best replacement for iphone app is android app.

The best alternatives to iphone app are rated as following:
★★★★★  android app
★★★★★  ipad app
★★★  mobile website
★★  gps
★★  web app
★  webapp
★  garmin
★  droid app
★  tomtom gps
★  sat nav
  garmin gps
  bike computer

Your alternative for iphone app is not listed? Suggest!
Speaking about iphone app, one probably shouldn't forget about camera timer.

Other search terms related to iphone app and their ratings are:
★★★★★ camera timer
★ heart rate monitor
photo timer
You have in mind a companion for iphone app and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of iphone app in all years. Click on graph for more.
iphone app
android app
ipad app