The best replacement for pebble is pebble steel.

The best alternatives to pebble are rated as following:
★★★★★  pebble steel
★★★★★  galaxy gear
★★★★★  fitbit
★★★  sony smartwatch
★★★  metawatch
★★  iwatch
★★  fitbit force
★★  plaster
★  samsung gear
★  basis
★  plaster pools
★  toq
★  sw2
★  cabriofix
★  cookoo
★  gear 2
★  android wear
★  quartz pool finish
★  kreyos
★  fitbit flex
★  gear
  moto 360
  sony smartwatch 2
  pebb
  gravel
  cabriofix maxi cosi
  kreyos smartwatch
  smartwatch
  sony smart watch
  samsung gear 2
  plaster pool
  pebble sheen

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

Other search terms related to pebble and their ratings are:
★★★★★ runkeeper
★★★★★ isofix
★★★★★ bugaboo
You have in mind a companion for pebble and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of pebble in all years. Click on graph for more.
pebble
pebble steel
galaxy gear