The best alternatives to Botmock are Mockuuups, LendLayer, and Botsociety. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Your conversational design suite. Design and prototype your next chatbot or voice assistant. Create a mockup of your project on Messenger, Slack, Google Assistant, Alexa and more. The next generation design solution for chatbots and voice.