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Back in the early days of the Newton, there was an app that let you manipulate algebraic expressions by dragging and dropping individual elements of the expression. Think factoring out a common factor represented by the expression sprouting parentheses with the factor out front. There was a later effort called MathDrag'n but that seemed to run out of steam.
Does anyone know if a similar thing exists and is maintained now?
This type of app seems like it would be useful, and I know I'm basically asking for free candy, but I don't find 30 day trials that useful. I'll toy around with it now, but 35 days later think about it for serious work and ever really get to evaluate it. Or, I'll drop $30 on it now and never think about it again.
There are a bunch of animated gifs that show off how Soulver works - great! But just as they finish the exercise and show the result, they immediately blank and restart. I don't get any time to figure out what just happened. It's incredibly frustrating.
Put a 5s pause at the "complete" frame.
A great option which is similar but different and which I enjoy very much is: https://speedcrunch.org/