The best replacement for curlers is rollers.

The best alternatives to curlers are rated as following:
★★★★★  rollers
★★★★  curling iron
★  straighteners
★  rods
  hot rollers
  curling irons
  hair rollers

Your alternative for curlers is not listed? Suggest!
Speaking about curlers, one probably shouldn't forget about no heat.

Other search terms related to curlers and their ratings are:
★★★★★ no heat
★★★★ curly hair
You have in mind a companion for curlers and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of curlers in all years. Click on graph for more.
curlers
rollers
curling iron