The best replacement for bicep curls is hammer curls.

The best alternatives to bicep curls are rated as following:
★★★★★  hammer curls
★★★★  chin ups
★  concentration curls
★  pull ups
★  preacher curls
★  push ups
  chinups
  sitting

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

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



Google Trends

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bicep curls
hammer curls
chin ups