TL;DR: This app tells you what percent of the world you can talk to based off of a checklist of the languages you speak. Its super cool.
In our globalized world it is increasingly occupationally and socially important to speak a variety of languages. This tool helps users calculate the usefulness of the languages they speak, and helps employers calculate the efficacy of potential employees based off of their multilingualism.
WARNING- This app does not currently support iPhone 4s or older models.