Full disclosure: I made this for travelers because I've been to a lot of countries where I tried to communicate ideas by miming, pointing, and making goofy hand motions.
It's a picture-based phrasebook that lets you string together images and show a question or concept to somebody on the screen. It's free to download; you have to pay for all the pictures. You can search the App Store for "YesIcon" or go to yesiconapp.com