PocketBooks an accounting app which can be used for personal or business use.
Users can save accounts and transactions which includes withdraw, deposit and transfer for the accounts.
Each transaction can have a category selected from category list and category list can be edited by the user.
Distinguishing feature of PocketBooks compared to similar apps is supporting using multiple currencies for each account.
To ensure users won't lose their data due to changing or loosing their phone, PocketBooks provides with a feature to upload a copy of app data to google drive and restore from google drive, for using this feature users need to log in to a Gmail account.
User's Gmail is used by the app to connect to google drive to upload backup data information related to user's Gmail account is collected by the Sadr Soft (Pocket Books app's Developer).
Below is the link to PocketBooks privacy policy.