Privacy Policy

Last updated: August 19, 2026

This Privacy Policy applies to the following application developed by Codicium:

1. Overview

Codicium respects your privacy. Just One is designed to be as private as possible. There is no account to create, no sign-in, and no sync. We do not collect, store, or share any of your personally identifiable information (PII).

2. Your Habit Data Never Leaves Your Device

Everything the app records — the name of your habit, the days you marked it kept, your current and best streaks, and any habits you have previously replaced — is stored only in local storage on your device. None of it is transmitted to us or to anyone else, and we have no way to read it.

Uninstalling the app permanently deletes this data. Because it is never uploaded, there is no backup we can restore for you, and no account for you to delete.

3. Data Collection and Use

We do not collect your name, email address, phone number, contacts, or location. We do not operate analytics or crash-reporting services in this app.

The one exception is advertising. The free version of Just One shows a single banner advertisement, and to serve it, Google AdMob may access your device's advertising ID and related device information. This is described in section 4.

4. Third-Party Services

The App uses third-party services that may collect information used to identify you. These services include:

• Google AdMob: Used to display a single banner advertisement. AdMob may use your advertising ID and device information to serve personalized or non-personalized ads. View Google's Privacy Policy
• Google Play Services and Google Play Billing: Used for the optional one-time purchase that removes advertisements, and for basic app functionality. Payments are handled entirely by Google; we never see or store your payment details. View Google's Privacy Policy

5. Your Choices About Advertising

If you are in the European Economic Area, the United Kingdom, or Switzerland, the App asks for your consent before showing personalized advertisements, using Google's official consent flow. You may change or withdraw that choice at any time.

On any device, you can reset or delete your advertising ID from your Android system settings, under Settings → Privacy → Ads. You can also remove advertising from the App entirely with the one-time in-app purchase, after which no ad requests are made at all.

6. Permissions

The App may request the following permissions to function correctly:

• POST_NOTIFICATIONS: To show the optional daily reminder. The reminder is off by default, and declining this permission leaves it switched off.
• RECEIVE_BOOT_COMPLETED: To restore your daily reminder after your device restarts.
• VIBRATE: To provide haptic feedback when you mark a day kept.
• INTERNET and ACCESS_NETWORK_STATE: To load advertisements and verify in-app purchases. The App does not send your habit data over the network.
• AD_ID and related advertising permissions: Used by Google AdMob to serve advertisements.
• com.android.vending.BILLING: To facilitate the in-app purchase.
• WAKE_LOCK and FOREGROUND_SERVICE: Required by the notification component the App uses to schedule your daily reminder.

7. Children's Privacy

Our App does not knowingly collect any personal information from children. If you are a parent or guardian and you are aware that your child has provided personal data, please contact us.

8. Changes to This Policy

We may update our Privacy Policy from time to time. You are advised to review this page periodically for any changes. Changes are effective immediately after they are posted on this page.

9. Contact Us

If you have any questions or suggestions about our Privacy Policy, do not hesitate to contact us at codicium91+dev@gmail.com.