The best replacement for google keep is evernote.

The best alternatives to google keep are rated as following:
★★★★★  evernote
★★★★  google tasks
★★★  any.do
★★★  onenote
★★★  wunderlist
★★★  springpad
★★  simplenote
★★  gnotes
★  pocket
★  s note
  trello
  colornote

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

Other search terms related to google keep and their ratings are:
★★★★★ google now
★★★ mac notes
★ ios notes
You have in mind a companion for google keep and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of google keep in all years. Click on graph for more.
google keep
evernote
google tasks