Last week I had to do a workshop about WolframAlpha, and I noticed that there are three different feature sets: not logged in, logged in, logged in to Pro.
I needed to know which login settings provided which features (especially for giving workshops and working with students), so I decided to be thorough about it. You can download the PDF of this document, Guide to Wolfram Alpha Features, as well.
Hope this makes the decision-making a little easier for you!
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