NQ Mobile Vault compare (iOS)

While it does boast some nifty premium features, NQ Mobile Vault still needs a few more tools in order to be considered a must-have app.

TrustGo is one of the most robust Android security apps we've seen, and it's completely free.

If you're looking for a bookmarking tool that syncs across devices, then look no further. Better than Instapaper and other competitors, Pocket is the app to beat in the category.

It may not spell out its methods in a Help section, but Advanced Mobile Care is effective at scanning and optimizing your Android system.

If you live in an area with frequent or seasonal severe weather, Storm Shield is a good app to have around for updates about your immediate location.