The best replacement for switchblade is butterfly knife.

The best alternatives to switchblade are rated as following:
★★★★★  butterfly knife
★★★  stiletto
★★★  spring assisted knife
★★★  crossbow
★★★  assisted opening
★★  drop speed
★★  pocket knife
★★  demonseed
★★  otf
★★  spring assist
★  folding knife
★  nine two five
★  balisong
★  9two5
★  supermodel
★  automatic knife
★  tomahawk
★  coreblade
★  switch
★  stiletto knives
★  assisted opening knife
★  assisted
  drop carve
  rayne nemesis
  north rebel
  gravity knife
  rayne demonseed
  spring assisted
  925

Your alternative for switchblade is not listed? Suggest!
Speaking about switchblade, one probably shouldn't forget about brass knuckles.

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



Google Trends

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switchblade
butterfly knife
stiletto