Do you manage your money with your mobile phone? More than one in five mobile phone users have used their device to access their bank accounts in the past year, according to the Federal Reserve – and twice as many plan to use mobile banking at some point.

Ally customers can enjoy the benefits of managing their finances on the go with Ally Mobile Banking. But lots of other mobile apps can make managing your finances as convenient – and many are free. Here are four that caught our eye.

Adaptu (Android, iOS) – This app promises a “comprehensive view of your financial life,” letting you create budgets and receive spending alerts. Adaptu also lets you store insurance and rewards cards, so you don’t have to carry them.

ProOnGo (Android, Blackberry, iOS) – If you’re a business owner or working professional trying to track expenses easily, this app might become your new best friend. ProOnGo helps you track mileage, send receipts, and even approve employee expenses. (Some features are available by subscription.)

Key Ring (Android, Blackberry, iOS) – If all you need is an app to manage your rewards cards, Key Ring may be for you. It lets you scan and save the bar codes associated with your loyalty programs – and even your gym membership card.

Wikinvest Portfolio (Android, Blackberry, iOS) – Need an easy way to track your financial portfolio? Wikinvest is a beautiful application that can let you manage portfolios from more than 60 brokerages.

Which free mobile applications do you use to manage your finances on the go? Have you tried any of the apps on our list?