The best replacement for irb is pry.

The best alternatives to irb are rated as following:
★★★★★  pry
★★★  crb
★★★  local irb
★★★  not to irb
★★  ethics committee
★★  rails console
★  iacuc
★  iec
★  central irb

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No companions for irb have been suggested so far.
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Google Trends

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