Privacy Policy

This Privacy Policy explains what information Linemate: AR Drawing Tracer ("the app", "we", "us") collects, why, who receives it, and the choices you have. It describes the app's actual technical behaviour. The app has no user accounts: we never ask for your name, email address, phone number or contacts, and you can use every feature without signing in.

1. Information collected automatically

The app shows ads and uses Google Firebase to understand usage and fix crashes, and its AR mode runs on Google Play Services for AR (ARCore). These services, built into the app as software development kits (SDKs), collect the following data automatically:

• User IDs (your Google account identifier, only while AR mode runs on a phone signed in to Google): used for analytics. Collected by Google Play Services for AR (ARCore).
• Approximate location (derived from your IP address, never GPS): used for analytics, fraud prevention, security and compliance, and advertising. Collected by Google AdMob, which also shares it with its advertising partners as described in its policies, and by Firebase Analytics.
• Device or other IDs (such as the Android advertising ID, app set ID and Firebase installation ID): used for analytics, fraud prevention, security and compliance, and advertising. Collected by Google AdMob (which also shares it), Firebase Analytics, Firebase Crashlytics and, while AR mode runs on a phone not signed in to Google, Google Play Services for AR (ARCore).
• App interactions (screens opened, buttons used, ad impressions and clicks, feature events, and in AR mode the ARCore features the app calls): used for app functionality, analytics, fraud prevention, security and compliance, and advertising. Collected by Google AdMob (which also shares it), Firebase Analytics, Firebase Crashlytics and, in AR mode, Google Play Services for AR (ARCore), which uses it for analytics and to keep AR working.
• Diagnostics (device model, Android version, app version, performance and loading data; in AR mode also battery use, latency and frame rate): used for analytics, fraud prevention, security and compliance, and advertising. Collected by Google AdMob (which also shares it), Firebase Crashlytics and, in AR mode, Google Play Services for AR (ARCore).
• Crash logs (technical details of a crash, such as the stack trace and device state): used for analytics, so we can find and fix bugs. Collected by Firebase Crashlytics.
• Purchase history (that the Remove Ads screen was opened, which plan was chosen, and whether a purchase started, succeeded or failed; never your payment details): used for analytics. Collected by Firebase Analytics.

We do not sell this information and we do not use it to identify you personally. Data is encrypted in transit: the app only connects over HTTPS.

AR mode. This application runs on Google Play Services for AR (ARCore), which is provided by Google and governed by the Google Privacy Policy. ARCore is used only when you choose AR mode on the tracing screen, on phones that support it. While AR mode runs, ARCore collects your Google account identifier if your phone is signed in to Google (otherwise a device identifier), performance and diagnostic data about the app, ARCore and your phone (such as battery use, latency and frame rate), and data about the ARCore features the app calls. Google uses this data for analytics and to keep AR working correctly, does not share it with third parties, and encrypts it in transit. The app does not use Cloud Anchors or location-based AR, so ARCore does not send camera images or your location for AR mode.

2. Information that stays on your device

Most of what you do in the app never leaves your phone:

• Camera image. In Camera mode and AR mode the live camera picture is shown only on your screen, under the sketch you are tracing. It is not uploaded or sent anywhere. In AR mode, Google Play Services for AR processes the camera picture and motion sensor data on your phone to find your table and keep the sketch on your paper.
• Your drawings, photos and time-lapse videos. Photos you pick with the Android photo picker, sketches made by Photo to Sketch (processed entirely on your phone), drawings you save to My Art and time-lapse recordings are stored on your device. On Android 10 and later, a copy of each drawing you save from the tracing screen or Grid Method also goes to your gallery (Pictures/Linemate), without any permission; on Android 9 and earlier this copy is made only if you have already allowed Storage. A time-lapse is saved to your gallery only when you tap Export Video. Nothing is shared unless you choose Share, which opens the standard Android share sheet and sends the file to the app you pick.
• Words to Sketch. The words you type are matched on your phone against the sketches included in the app; they are never sent anywhere. Pages you keep (Favorite or Trace This) are stored on your device like your other sketches.
• Settings and progress. Favorites, tracing session (sketch, position, size, opacity, step), levels, 14-Day Path progress, reminder time, language and other preferences are stored locally in the app's private storage.
• Background music. Music is generated on your phone; no audio is streamed or recorded. The app never uses the microphone.

Uninstalling the app or clearing its data in Android settings deletes this information. Android's own backup service may include app settings in your Google account backup if you have backup turned on.

3. Features that use the internet

• App configuration. The app periodically downloads a small settings file from our website (sensitech.web.app) that controls how ads are shown and how often they appear. No personal data is sent with this request. The file can set different ad timing per country; the app picks the one for your country on the device, using the country code of your SIM card, mobile network or language setting, and never sends that code anywhere.

4. Permissions and why the app asks for them

• Camera: requested only when you open Camera mode or AR mode on the tracing screen, to show the paper under the sketch (and, in AR mode, to let ARCore find your table). The picture is not stored or sent unless you save a drawing or record a time-lapse yourself. Screen mode works without this permission.
• Notifications (Android 13 and later): requested only when you turn on the Daily reminder of the 14-Day Path, which is off by default. It sends one drawing reminder a day and never ads.
• Run at startup (RECEIVE_BOOT_COMPLETED): restores your daily reminder after the phone restarts, only if the reminder is turned on.
• Storage (Android 9 and earlier only): requested when you tap Export Video, to save the time-lapse to your gallery. The app does not read your other photos or videos. Android 10 and later need no permission for this.
• Internet and network state: to load ads and the app configuration, and to check whether a connection is available.
• Billing (com.android.vending.BILLING): to sell the optional Remove Ads subscription through Google Play.

The app does not request precise location, microphone, contacts, or access to your accounts.

5. Advertising partners and your choices

The app is free and supported by ads from Google AdMob. Ads may be personalised using the data in section 1 where the law and your choices allow it. The tracing screen never shows ads, and rewarded ads (the button that turns off ads for a while, 2 hours unless the button says otherwise) play only when you tap that button yourself.

• Google AdMob collects and shares data as described in Google's Privacy Policy and How Google uses information from sites or apps that use its services.
• Google Firebase (Analytics and Crashlytics): Privacy and Security in Firebase.

Consent. In regions where consent is required (such as the European Economic Area, the United Kingdom and Switzerland), the app shows Google's consent form (User Messaging Platform) before personalised ads are requested. You can change your choice at any time in the app: Settings → Privacy options. This row appears only in regions where the form applies.

Advertising ID. You can reset or delete your advertising ID in Android settings (Settings → Privacy → Ads, or Settings → Google → Ads on some phones). After that, apps can no longer use the old ID for personalised ads.

US state privacy laws. Sharing data with ad partners for personalised advertising may be considered "sharing" or "targeted advertising" under laws such as the California CCPA/CPRA. We do not sell personal information for money. To opt out, delete your advertising ID as described above, or contact us at the email below.

6. Purchases

The optional VIP subscription only removes ads; every feature and all content are free for everyone. Purchases are processed entirely by Google Play. The app never receives or stores your card number or other payment details; it only receives confirmation from Google Play that the subscription is active.

7. Children

The app is intended for teens and adults learning to draw and is not directed at children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has provided information through the app, contact us and we will help delete it.

8. Retention and deletion

Data on your device is kept until you delete it in the app, clear the app's data, or uninstall the app. Data collected by Google AdMob, Firebase and Google Play Services for AR is kept by those providers according to their own retention policies linked above. Because the app has no accounts, we cannot link this data to you by name; to request deletion, email us and we will explain how to reset the identifiers involved and forward the request where we can.

9. Your rights

Depending on where you live, you may have the right to access, correct, delete or object to the processing of your personal data, to withdraw consent, and to complain to your data protection authority. You can withdraw ad consent in Settings → Privacy options, reset your advertising ID, or contact us to exercise these rights.

10. Security

All network connections from the app use HTTPS, and your local data is kept in the app's private storage, which other apps cannot read. No method of transmission or storage is completely secure, but we use reasonable measures to protect the information described here.

11. Changes to this policy

If the app's data practices change, we will update this page and its effective date. Significant changes will also be reflected in the app's Data safety section on Google Play.

12. Contact

Questions or requests about this policy: Sensi Tech, CC Đồng Phát, Hà Nội 11700, Vietnam. Email: hanhnt3009.ffh4x.publish@gmail.com