What does "the future hopefully is much bigger" mean for a calculator application? Competition with Wolfram Alpha? Unless you're doing something on that scale, I can't imagine what you mean.
"Much bigger" doesn't need to mean we're gonna send people to Mars. Solving even small problems for tens or hundreds of millions of people qualifies as "much bigger" for me.
I'm curious, what is the most requested new feature you're getting from your users.
Feature request come from markup/profit margin and "trader's" calculator users. And they have more serious needs (and they never want the same thing...).
Of course I can do it, but when I'm talking with people I'd rather do it much faster with less likelihood of a mistake.
Move the decimal point to the left, then double. Boom, %20.
Instead of running around trying to find an answer for "how will you be worth a billion dollars?!?!?!!!!" they should be figuring out where their market is.
Also from the site "Humans make mistakes. This app doesn’t."
Bold claims.
But I could imagine something like WA with a nice mobile interface being a must have app.