Has anyone done this and if so how was the response? Did it spur questions about the app? Do you think a screen shot is good enough quality to put on a business card?
Also, you're paying more for higher quality printing, and most people you give these cards too to will wind up forgetting about them or throwing them away. Maybe, instead of a screenshot, consider hiring someone to create a simple infographic better suited to the format, that could communicate the concept more clearly, and look good on less expensive stock.
I agree that graphic would be better. I just wanted something I could pass out for next two weeks while I workout a better way to present the app on the card. It would be better to personally talk to everyone but for some events that would not be possible.
Even so, if you've got to the point of exchanging business cards with somebody, wouldn't your amazing app already have been discussed?
Yes it would be better just to tell people about the app. But for next few weeks I will be at events that the best shot I will be able to do is pass them out to people as they walk by.