The best replacement for abacus is calculator.

The best alternatives to abacus are rated as following:
★★★★★  calculator
★★★★  kumon
★★  soroban
★★  slide rule
★★  amicus
★★  vedic maths
★★  rekenrek
★  time matters
★  vedic mathematics
  ansys
  vedic
  wilco a380
  wilco
  chinese abacus
  enopi
  amadeus
  vedic math
  slide ruler

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Speaking about abacus, one probably shouldn't forget about maths.

Other search terms related to abacus and their ratings are:
★★★★★ maths
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