The best replacement for simsimi is cleverbot.

The best alternatives to simsimi are rated as following:
★★★★★  cleverbot
★★★  senyora
  chat

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Speaking about simsimi, one probably shouldn't forget about talk.

Other search terms related to simsimi and their ratings are:
★★★★★ talk
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Google Trends

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simsimi
cleverbot
senyora