Onavo, in simple terms, is a data managing app which helps you control your data and find which apps are data hungry.
With carriers now adding stupid caps to our data usage on our devices, managing how much you use is very important unless you don't care about the £100 bill at the end of the month.
First thing you will notice about the app is how well designed and user friendly it is. They haven't just bunged this app together as quick as possible, they put time and effort into for us, the Android geeks.
You can set your data plan usage by how many MB you get a month and at what date this resets. Mine is on 500MB and resets on the 12th August. I got the app a few days ago so it hasn't got the whole months 3G usage.
The top bit shows what day you are into your month and how much you have used so far of your data in very simple terms, I like it.
When in "Data Plan Advice" it will show info in more detail. It will also estimate how much you might use in your current month. This didn't work for me however because as I said earlier, I've only had the app for a few days so it hasn't collected enough data to calculate that.
When you hit that button at the top, the one with the arrow in the circle, you can change the time frame. So you can specifically look at today, for the week or for the month.
The "App Watch" shows detailed info about the apps on your device. It tells you info such as, which app has used the most data and how much data it is using. If you find an app is using a lot of data you can either "restrict to WiFi" or uninstall it completely from right within the app. The "restrict to WiFi" is a genius feature which will definitely be useful for many users.
Overall this app is definitely going to be a good one for those who have limited data plans and want to be able to control their apps. It's already very popular on the iOS platform and will hopefully be the same in the Android market.