Carat 2.01 can also show App Recommendations on iOS 9.0 through 9.3.2!

Our next release will include settings recommendations for iOS 9.3.3+. We are already collecting the data for this, so stay tuned!


Carat is the first app to generate personalized recommendations for improving your battery life. After observing your use of the device for *a week or more*, it will start to generate reports just for you. You should open the app once every day or so, with an Internet connection turned on, until you start seeing results.

Although Carat uses Location Services (thus displaying the little icon), it is NOT using your GPS and is NOT running in the background. The app uses almost no power.

** Thank you! **

Ever wondered why your battery is draining so quickly? Just install Carat, open it every few days with an Internet connection turned on so it can send data to our servers, and within a week Carat will start recommending Actions (just for you!) and even predicting the improvements you will see. Although Carat cannot measure energy use directly, it infers what apps are responsible using advanced machine learning methods.

And it's free!

As you use your device, Carat occasionally takes measurements and sends them to our backend servers in the cloud, where we apply cutting-edge algorithms to determine what steps you can take to use less energy. By collecting snippets of non-personal data from a large number of devices, Carat does not need to run continuously in the background. Nothing we collect identifies you, personally.

Carat will tell you which apps generally use a lot of energy and and those that specifically do so on your device (but not on most others). This does not make an app 'bad', but this advice can help a user improve their battery life.

== Carat Features ==

- Action List telling you how to improve your battery life and by how much
- Device information detailing exactly what data we are recording
- Reports apps that are using lots of energy and whether that is happening on other devices, too
- Detail views let you dive down into the data
- Low-overhead sampling requires almost no energy or CPU
- J-Score tells you how your battery efficiency compares to other users
- Sharing features let you post/tweet/blog about your experience; more users means more data which means better recommendations for you

Carat is under active development by a team of researchers in University of Helsinki. We are constantly making improvements, adding features, and giving you more knowledge about how your device is using energy. Remember, knowledge is power!

What’s New

Version 2.014

New icon
Fix display of model name for newer iPhones. Get model names from server-side.

Ratings and Reviews

Steeldove ,

not impressed

It told me to update my operating system but it WAS already updated. (Wasted my time...grrrr!!!!) The contact link and other links on the About screen don't work. Oh yeah, it crashes lots too.

LeNautilus ,

Wonderful app & recommended!!!

Carat is not the most prettiest bling-bling app on the AppStore, but it is the most useful app for every iOS owner.

There are a lot of battery management apps in the AppStore, but not like this one. This one is special.

All the other apps just notify you how much battery life you’ve used. With Carat it's wow! It will tell you the buggy apps that is draining the battery of your precious.

Wonderful app and I recommend to all iOS users & the updates are amazing enhancement.

Stitcher C ,

Doesn't work on my iPhone6

Loved this app on my old iPhone4, but despite using it very regularly for over a month, it is not giving me a score.


University of Helsinki
14.3 MB
Requires iOS 7.0 or later. Compatible with iPhone, iPad and iPod touch.
English, Finnish
Age Rating
Rated 4+
© 2012-2017 University of Helsinki, Department of CS & UC Berkeley, AMP Lab


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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