The best replacement for agar is agarose.

The best alternatives to agar are rated as following:
★★★★★  agarose
★★★★★  gelatin
★★★★  broth
★★  carrageenan
★★  pectin
★★  xanthan gum
★  nutrient broth
★  liquid culture
★  arrowroot
★  agar agar
★  guar gum
★  nutrient agar
★  chocolate agar
★  bacto agar
  blood agar
  lb broth
  macconkey agar
  china grass
  agarose gel
  emb
  jello
  irish moss
  sodium alginate
  agar
  phytagel
  guar
  lc
  trypticase soy agar
  tryptic soy agar
  tsa

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

Other search terms related to agar and their ratings are:
★★★★★ bacteria
★★★★ petri dish
★★ lactose
★★ 5% sheep blood
You have in mind a companion for agar and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of agar in all years. Click on graph for more.
agar
agarose
gelatin