Customer Book
Effective 31 August 2026 · com.arzdrz.customer.management
Your customers’ names, numbers and debts stay in the app’s private storage on your phone. The app is free and shows ads, and the ads are the only reason it uses the internet: nothing from your book is ever sent to me or to the advertiser.
This policy covers the mobile app Customer Book, published by Akshay CP on Google Play. The app keeps a book of your customers and what each of them owes you, with a full payment ledger, PDF statements and CSV backup.
The customers, amounts and notes you enter stay on your device. The app does the work locally, using your phone's own processor and storage. Nothing you create or open is uploaded to me or to anyone else, and I have no way to see it.
Anything the app saves is written where you ask it to be written, and any list of recent items exists only on your device. Uninstalling the app removes it.
The app can fill in a new customer from your phonebook, so you don't have to retype a name and number you already have. Android asks your permission at the moment you tap that button, never at launch, and declining leaves every other part of the app working normally.
Your contacts are read on your device and only at that moment. The app copies across only the details of the one contact you pick, into the customer you are creating. It does not scan, index, upload or keep a copy of your address book, and it never writes anything back to it.
You can optionally protect the app with a PIN, and add your fingerprint or face on top of it. This is off until you turn it on.
The PIN is never stored as you typed it. It is stored as a salted SHA-256 hash, stretched over 12,000 rounds, on your device only. Fingerprint and face recognition are handled entirely by Android's own biometric system — the app is told only whether the check passed, and never receives or stores your fingerprint or face data.
Because there is no account and no server, there is no “forgot PIN” recovery and no way for me to unlock the app for you. Keep a CSV backup.
The app can post notifications and reminders on your device. These are generated locally from what you have entered. There is no push server, so nothing is sent to me in order to show them.
The free version of the app shows ads supplied by Google AdMob. To serve them, AdMob may access your device's advertising identifier — the Advertising ID — along with general information about your device such as its model, operating system version, language, rough location derived from your IP address, and how you interact with ads.
That information is handled by Google under its own privacy policy, which you can read at policies.google.com/privacy.
On Android, you can reset or delete your Advertising ID at any time in your device settings under Google › Ads.
I do not run a server for this app. There are no accounts, no logins, and no analytics of my own. I do not collect your name, email address, contacts, photos or documents. The only data leaving your device is what Google AdMob collects to show ads, as described above.
A customer book is largely a list of other people's names, phone numbers and debts. Those people never agreed to anything with me, which is exactly why none of it is sent to me. It stays in the app's private storage on your phone.
Android's own Auto Backup may copy that file into your Google account's backup, encrypted, so a new phone can restore it. That is a service between you and Google under their privacy policy, and I have no access to it. You can turn it off in your device's backup settings. Anything else — a CSV you export and share — goes only where you send it.
Because you hold this data about your customers, you are the one responsible for it. Keeping the phone locked and the app lock switched on is the practical protection.
This app is a general-purpose tool and is not directed at children under 13. I do not knowingly collect personal information from children. If you believe a child has provided personal information, please get in touch and I will look into it.
If this policy changes, the updated version will be posted on this page with a new effective date.
Questions about this policy, or about anything the app does, are welcome at contact.akshaycp@gmail.com.