When it comes to free apps for your smartphone, it seems they can be more costly than paid versions.
Free, ad-supported apps have two hidden costs: They use your phone’s data connection and battery power to download and display ads. In the long run, using a free app may be more expensive than buying the paid version.
If you have a phone with a huge battery and an unlimited data connection, you may not be too concerned about this. But if you’re like most people, you may just want to pay the 99 cents for the app rather than paying for the app in additional data and electricity use.
A 2012 study found that as much as 65 to 75% of the energy used by popular ad-supported Android apps was used on advertising. 75% of the power used by the ad-supported version of Angry Birds was for advertising functions. In other words, the paid, ad-free version of Angry Birds used 25% of the power of the free, ad-supported version.