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.

@ohquu: people calculate craploads of things on a daily basis. More often than not they're using calculators that look pretty much the same as those in the 70's. I want to make it easier, faster and more pleasant. I want people to be able to calculate things that right now they can't and aren't willing to learn how to.

"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 glad you have a successful application, but are people really unable to multiply their bill by 1.15 to get the new total with a tip?

I'm curious, what is the most requested new feature you're getting from your users.

Yeah, simple percentage, tip & discount calculators are the most used.

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...).

This is actually the most stressful part of dinner. Along with splitting a bill fairly.

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. Boom, %10.

Move the decimal point to the left, then double. Boom, %20.

Asking this question is exactly why they shouldn't take VC money.

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.

Made my day, thank you.

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.