The best replacement for nest is honeywell.

The best alternatives to nest are rated as following:
★★★★★  honeywell
★★★★  ecobee
★★★  honeywell thermostat
★★★  honeywell wifi
★★  iris
★★  honeywell prestige
★★  honeywell wifi thermostat
★★  programmable thermostat
★  hive
★  z wave
★  tado
★  honeywell lawsuit
★  vindictus
★  birdi
★  hornet nest
★  opower
★  icomfort
★  evohome
★  adt pulse
★  lair
★  anderson
★  alarm.com
★  hive thermostat
★  wasp nest
★  control4
  thermostat
  honeywell smart
  cocoon
  rusty hearts
  sparrow nest
  honeywell rth9580wf
  gpp
  nexia
  ecobee thermostat
  vivint
  cave bird nest
  hornets nest
  bees nest
  bee nest
  dragonica
  venstar
  baby ktan
  honeywell prestige hd
  professor k nest
  bee hive

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

Other search terms related to nest and their ratings are:
★★★★★ multiple zones
★★★★★ smartthings
★★★ aprilaire
★★★ home automation
★★ insteon
★★ carrier infinity
★ harming birds
★ birds
★ bird
You have in mind a companion for nest and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of nest in all years. Click on graph for more.
nest
honeywell
ecobee