Interesting app. I asked it the following and got solid answers:

Calculator:
“three plus four”
“thirteen minus five”
“seven times eight”
“twelve divided by four”
“eight raised to the power of three”
“eight percent of seven”
“fifth root of thirty-two”
“ten factorial”
“tangent of 45 degrees”
“sin of pi divided by 3” Note: I had to pronounce sin as "syn". Eindroid didn't work when I pronounced "sin" as “Sign”
“log 500”
“1 minus 8 minus 555 times 1,234 equals” I discovered that you need to say the word “equals” after the expression.
“10 factorial”

Conversions:
“5 kilometers in miles”
“speed of light”
“speed of light in miles per hour”
“20 in roman numerals”
“ounces in a cup”
“meters in inches

Weather:
"san francisco california"
"london england"

Time:
"paris”

Sports Scores:
“san francisco 49ers”

Earthquake:
“earthquake”

Dictionary:
“earthquake”

Not all of my questions were answered correctly. I fed it a few @#$%! words. No definition. Seemed to recognize I was saying something bad because the response was different than when it did not recognize what I said. I have a cery slight lisp and was surprised that it worked as well as it did.

In my opinion it is worth 99 cents USD.

I would be interested in additional queries.

This is actually a pretty cool app.

Sy