Answer
Here are some alternatives to Perplexity AI that do not require registration or SMS:
ChatGPT: This is an AI chatbot that can answer questions in a conversational way, similar to Perplexity AI1
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Google Assistant: This is a virtual assistant developed by Google that can answer questions, make recommendations, and perform actions based on voice commands2
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Wolfram Alpha: This is a computational knowledge engine that can answer factual questions and perform calculations2
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Quora: This is a question-and-answer website where users can ask and answer questions on a wide range of topics2
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Stack Exchange: This is a network of question-and-answer websites on various topics, including programming, mathematics, and science2
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It's worth noting that some of these alternatives may require registration for certain features or services.