The best replacement for bicep curl is hammer curl.

The best alternatives to bicep curl are rated as following:
★★★★★  hammer curl
★★  preacher curl
★★  chin up
★★  reverse curl
★  hammer
★  incline bicep curl
★  concentration curl

Your alternative for bicep curl is not listed? Suggest!
Speaking about bicep curl, one probably shouldn't forget about lunge.

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



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bicep curl
hammer curl
preacher curl