The best replacement for smartthings is vera.

The best alternatives to smartthings are rated as following:
★★★★★  vera
★★★★★  revolv
★★★  insteon
★★★  wemo
★★★  micasaverde
★★  ismartalarm
★★  piper
★★  staples connect
★★  nexia
★  homeseer
★  ninja blocks
★  wigwag
  veralite
  mi casa verde
  almond+

Your alternative for smartthings is not listed? Suggest!
Speaking about smartthings, one probably shouldn't forget about nest.

Other search terms related to smartthings and their ratings are:
★★★★★ nest
★★★ wemo
You have in mind a companion for smartthings and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of smartthings in all years. Click on graph for more.
smartthings
vera
revolv