The best alternatives to Cortana are Amazon, Calendar.help, and Ellp™. If these 3 options don't work for you, we've listed a few more alternatives below.
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Amazon.com, Inc., is an American multinational technology company based in Seattle, Washington, that focuses on e-commerce, cloud computing, digital streaming, and artificial intelligence.
Alma is a virtual assistant, it uses voice recognition queries, machine learning and a natural language synthesis to search information and answer questions.