The best replacement for google now is siri.

The best alternatives to google now are rated as following:
★★★★★  siri
★★★★  s voice
★★★  google search
★★  dragon
★★  voice search
★★  speaktoit
★★  nova launcher
★★  assistant
★  easilydo
★  voice mate
★  trebuchet
★  aviate
★  apple siri
  siri ios 7
  suri

Your alternative for google now is not listed? Suggest!
Speaking about google now, one probably shouldn't forget about chrome.

Other search terms related to google now and their ratings are:
★★★★★ chrome
★★★★ apex launcher
★★★★ tasker
★★★ nova
★★★ nova launcher
★ google keep
custom launcher
You have in mind a companion for google now and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of google now in all years. Click on graph for more.
google now
siri
s voice