The Real Cost of Free Mobile Apps: 79% More Data Usage + 16% Battery Drain

If you have an option to choose between a free, ad-supported mobile app or pony up a dollar or whatever the apps costs, you might be better off buying the app.

New research from the University of Southern California, Rochester Institute of Technology, and Queen’s University found that compared to apps without ads, apps with ads are a big drain on your battery, take up more processing time, and also use much more data.