Joggers out there who have been thinking about purchasing RunKeeper for iOS/Android but didn’t want to pay the $10 fee are in for a treat. The folks behind the app are offering the Pro version for free between now and the end of January. There is already a free, ad-supported version of this app, but the Pro version removes the ads and offers additional features such as audio cues, customized interval workouts and more. The audio cues can report your distance, speed, or pace while you’re running, and also notify you when it’s time to change intervals. The iOS version is already available for free, but the Android version is still listed at full price, though it should be changing soon.