The best replacement for ios 7 is android.

The best alternatives to ios 7 are rated as following:
★★★★★  android
★★★★★  ios 6
★★★  android 4.4
★★  android 4.3
★★  kitkat
★★  windows phone 8
★★  6
★★  ios 5
★  windows 8.1
★  android jelly bean
★  jellybean
★  android 4.2
★  android 4.2.2
★  jailbreak
  ios 7.1
  android 4.4.2
  windows 8
  windows phone
  ios 6 icons
  ios 6.1.3
  windows phone 8.1
  wp8
  android kitkat
  ios 6 speed

Your alternative for ios 7 is not listed? Suggest!
Speaking about ios 7, one probably shouldn't forget about iphone 4s.

Other search terms related to ios 7 and their ratings are:
★★★★★ iphone 4s
★★★★★ jailbreak
★★★★★ 4s
★★★★ ipad 2
★★★★ passcode
★★★★ iphone 3gs
★★★★ apple id
★★★ itunes 10.7
★★★ activation
★★★ udid
★★ itunes 10
★★ old look
★★ ipod touch 4
★★ cydia
★ xcode 4.6
★ xcode 4
★ 3gs
★ jailbreaking
★ ipad 2 problems
★ ios 6 icons
ipad 1
iphone 4
You have in mind a companion for ios 7 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of ios 7 in all years. Click on graph for more.
ios 7
android
ios 6