You can't divide out which apps are using the data, but you can quickly see if you're gobbling up a lot of data at any given moment in time. MobiStats also tracks your usage in real-time. If you notice that you use a lot of cellular data right around noon, maybe it would be a good idea to skip your daily Facebook check-in at lunch when you're trying to conserve cellular data. You can also filter this information by cellular, roaming, or Wi-Fi.
When viewing the stats by day, you can get a clear picture of when you use data the most. You can also track your stats history by day, month, and all time. For me, it doesn't matter how much Wi-Fi data I consume, so I switch over to cellular-only mode. You can filter this information for cellular, roaming, or Wi-Fi. It keeps a close eye on how much data you use on a daily basis and sets monthly forecast for your expected use. MobiStats is built on the idea that we can learn better data usage habits if we can see when and where we use data the most. If you just want a simple app for keeping track of your data usages, DataMan Next is the perfect app for giving you the info you need at a glance. Tap on "The Force" or "Winter Wonderland" to enable a special gift. You can also change the font style and colors, most of which will require an in-app purchase of $0.99 for the theme pack.
You can change the display styles from minimal, standard, and complete. The feature that makes DataMan Next stand out is the theme variations. You can set alerts to let you know when you reach 90, 70, and 50 percent of your allotment and export your statistics if you want to save the information on another device. The display also shows how many days until your current data allotment ends. At the bottom of the screen, you can see how much cellular data you've used and how much Wi-Fi data you've used.
It tracks your cellular and Wi-Fi usage and lets you know what percentage of your monthly allowance you've used. Without an in-app purchase, it doesn't have a whole lot of features, but it looks very good.