Apple is reportedly working on a new app called Healthbook for its iOS mobile devices that would help users track and monitor various parts of their health.

9to5Mac's Mark Gurman, who first reported the app in January, provided more details on Healthbook on Monday, citing unnamed sources who are working on the app.

Here are the main things readers need to know about Healthbook:

It looks like Apple's Passbook app: In terms of design, Healthbook is expected to look a lot like Passbook, one of Apple's existing apps that is used to store passes from numerous iOS apps. 9to5Mac included mock-ups of the app in its report, which are based on screen shots of the app that were provided to Gurman.

It will track data pertaining to various things: The main purpose of Healthbook will be to store health-related data tracked by users. The app will be able to keep information related to users' bloodwork, heart rate, hydration, blood pressure, physical activity, nutrition, blood sugar, sleep, respiratory rate, oxygen saturation and weight.

It could highly benefit users with diabetes: Healthbook's capabilities of tracking blood sugar could prove highly beneficial for users who have diabetes and have to check their blood sugar numerous times per week or day.

Adding blood sugar monitoring capabilities to the iPhone could make the process of checking this information much easier for users with diabetes.

To work, it may require the help of third-party apps and wearable devices: Although Healthbook will store users' health-related information, the app will likely not get this information on its own.

9to5Mac reported that the iPhone can get some information, such as how much users walk or how active they are, using its own components. But to collect other information, like weight, users may have to input it themselves. And for information such as hydration levels and blood sugar, users may have to use a wearable device.

This is where the Apple iWatch may come into play, Gurman reported. The long-rumored Apple smartwatch may feature components capable of helping users monitor their health, and it would then forward the information to the Healthbook app.

It would include a digital emergency card: Besides tracking users' health, Healthbook would also function as a digital emergency card for users. This means the app would store users' emergency contact information as well their name, birth date, medication information, weight, eye color, blood type, organ donor status and location.

It's being tested for iOS 8: Although the app may still be canceled, 9to5Mac reported that it is being tested to work with iOS 8, which is Apple's next operating system for the iPhone and iPad.

Apple could not be reached for comment.