The best replacement for spectre is ghost.

The best alternatives to spectre are rated as following:
★★★★★  ghost
★★★★  k&n
★★★  specter
★★★  galactus
★  mpl
★  living tribunal
★  kiparis
★  sparrow
★  ak74u
★  anti monitor
★  k&n air filter
★  ghost sc2
★  dr manhattan
★  maverick
★  ghost starcraft 2
★  beyonder
★  k&n filters
  parallax
  rector
  spectre pro
  hp envy
  mp5k
  eternity
  phantom stranger
  k&n filter
  hspice

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

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



Google Trends

Scale is based on the average worldwide traffic of spectre in all years. Click on graph for more.
spectre
ghost
k&n