The short version: the camera picture never leaves your phone.
1Camera
Brushee asks for the front camera, and uses it only while a brushing session is running.
- What it sees: the camera picture and the child's brushing motion.
- Why: to find the face and the toothbrush, so the app can say which area to brush next and for how long.
- Where it is processed: entirely on your device, by an on-device machine-learning model (MediaPipe). Frames are analysed in memory and then discarded.
- What leaves the device: nothing. Frames are never recorded, never saved, never uploaded. The app does not have the internet permission, so it is technically incapable of sending them anywhere.
You can decline the camera at first launch and revoke it at any time in Android Settings. Without it, the live guidance is unavailable but the app still works.
2What we do NOT collect
- Camera images, video, face landmarks, or any derived facial data.
- Location data.
- Advertising identifiers (no advertising ID is requested or used).
- Analytics, crash reports, or usage telemetry.
- Your name, email address, phone number or account credentials — Brushee has no accounts and no sign-in.
- Any device identifier (we do not read ANDROID_ID, IMEI, MAC address or similar).
We have no servers. Nothing about your child is transmitted to us or to anyone else.
3What is stored on your device
Brushee saves a small amount of data locally on your phone only:
| What | Why |
|---|---|
| Child's nickname | To greet the child and label their progress |
| Child's age | To pick the right parent-facing tip after brushing |
| Toothbrush type (manual / electric) | To tune the motion-tracking sensitivity |
| Brushing history (date, duration, star count, per-area coverage) | To build the progress report and streaks |
| Reminder times, voice and language preferences | To make the app behave the way you set it |
| Whether an unlock code has been redeemed | So you don't have to enter it again |
This is kept in the app's private storage. Other apps cannot read it.
System backup
Android can include app data in your phone's own backup (to your Google Drive), or in a device-to-device transfer when you change phones. This is a feature of your operating system, not something Brushee does — the data goes to your Google account, under your control, and we never see it. You can turn it off in Android Settings → System → Backup.
Only the data listed in the table above is included. Camera data never is, because none is ever stored in the first place.
Deleting it: open Settings → Child → Delete to remove a child's profile and history, or uninstall the app to erase everything at once. To also clear what went into a system backup, remove Brushee from your Google Drive backup in Android Settings.
4Subscriptions and payments
Brushee offers an optional subscription. All payment is handled by Google Play.
- We never see or receive your name, email address, card details, or any other payment information.
- The app asks Google Play whether a valid subscription exists. It receives only a yes/no answer — it cannot identify who you are.
- Google's handling of your payment data is governed by Google's Privacy Policy.
- You can view, manage or cancel your subscription at any time in Google Play → Subscriptions.
The app holds the com.android.vending.BILLING permission, which is what allows it to ask Google Play about your subscription. This does not grant the app internet access.
5Notifications
If you set brushing reminders, Brushee schedules a local notification at those times. Reminders are generated on the device; nothing is sent anywhere.
6Children's privacy
Brushee is designed for children aged 6–12 and is meant to be set up by a parent or guardian.
Because the app collects no personal information and transmits nothing off the device, there is no personal data for us — or anyone else — to hold about a child. The nickname, age and brushing history stay on your phone. We do not show advertising, we do not build profiles, and we do not share data with third parties.
Subscription settings and any unlock code are entered by an adult, behind a parental gate.
7Third-party components
Brushee uses these libraries, all running entirely on-device:
- CameraX — camera capture.
- MediaPipe Tasks Vision (Google) — on-device face and hand landmark detection.
- Google Play Billing (Google) — asking Google Play whether a subscription is active.
None of them sends data anywhere on our behalf, and the app declares no internet permission.
8Changes to this policy
If this policy changes, we will update the "Last updated" date above and publish the revised version at this URL.
9Contact
Questions about this policy: leonpq1987@gmail.com
一句话概括：相机画面绝不离开你的手机。
1摄像头
牙刷刷会申请使用前置摄像头，且仅在刷牙过程中使用。
- 看到什么：摄像头画面与孩子的刷牙动作。
- 用来做什么：定位面部与牙刷，从而告诉孩子下一步该刷哪里、还要刷多久。
- 在哪里处理：完全在你的设备上，由端侧机器学习模型（MediaPipe）处理。画面仅在内存中分析，随后即被丢弃。
- 什么会离开设备：什么都没有。画面不会被录制、不会被保存、也不会被上传。本应用不具备联网权限，技术上就不可能把它们发出去。
你可以在首次启动时拒绝授权，也可以随时在 Android 系统设置中撤销。没有摄像头权限时，实时引导不可用，但应用仍可正常使用。
2我们不收集什么
- 摄像头画面、视频、面部特征点，以及任何由此衍生的面部数据。
- 位置信息。
- 广告标识符（不申请也不使用任何广告 ID）。
- 统计分析、崩溃报告或使用行为数据。
- 你的姓名、邮箱、电话或账号凭据 —— 本应用没有账号，也不需要登录。
- 任何设备标识（不读取 ANDROID_ID、IMEI、MAC 地址等）。
我们没有服务器。关于你孩子的任何信息都不会被传给我们或任何其他人。
3保存在你设备上的信息
牙刷刷只会在你的手机本地保存少量数据：
| 内容 | 用途 |
|---|---|
| 孩子的昵称 | 问候孩子、标记进度归属 |
| 孩子的年龄 | 决定刷完牙后给家长的提示档位 |
| 牙刷类型（手动 / 电动） | 调整动作识别的灵敏度 |
| 刷牙记录（日期、时长、星数、各牙区覆盖） | 生成进度报告与连刷统计 |
| 提醒时间、语音与语言偏好 | 让应用按你的设置运行 |
| 是否已兑换过解锁码 | 免得你每次都要重新输入 |
这些数据存放在应用的私有目录中，其他应用无法读取。
关于系统备份
Android 可能会把应用数据纳入手机自己的备份（存到你的 Google Drive），或在你换手机时随设备间直传一起搬过去。这是操作系统的功能，不是牙刷刷在上传 —— 数据进的是你自己的 Google 账号，由你自己掌控，我们永远看不到。你可以在 Android 设置 → 系统 → 备份中关闭它。
进备份的只有上面表格里列出的数据。相机画面永远不在其中，因为压根就没有被保存过。
如何删除：在「设置 → 宝宝 → 删除」中移除某个宝宝的档案与记录；卸载应用则会一次性清除全部数据。若还想清掉已进入系统备份的部分，请在 Android 设置的备份中把牙刷刷移除。
4订阅与付款
牙刷刷提供可选的订阅。所有付款都由 Google Play 处理。
- 我们不会看到或收到你的姓名、邮箱、银行卡信息或任何其他付款信息。
- 应用只是向 Google Play 询问是否存在有效订阅，得到的仅仅是「是 / 否」，无法识别你是谁。
- Google 对付款数据的处理适用 Google 隐私政策。
- 你可以随时在 Google Play → 订阅 中查看、管理或取消订阅。
应用持有 com.android.vending.BILLING 权限，它允许应用向 Google Play 查询订阅状态。这条权限不会给应用任何联网能力。
5通知
如果你设置了刷牙提醒，牙刷刷会在相应时间发出本地通知。提醒完全在设备上生成，不涉及任何数据传输。
6儿童隐私
牙刷刷面向 6–12 岁儿童设计，应由家长或监护人完成设置。
由于本应用不收集任何个人信息、也不向设备外传输任何数据，我们（或任何第三方）都不持有关于孩子的个人数据。昵称、年龄与刷牙记录都留在你的手机上。我们不展示广告、不做用户画像、不与第三方共享数据。
订阅设置与解锁码的输入都由大人在「家长门」之后完成。
7第三方组件
牙刷刷使用以下库，全部完全在设备本地运行：
- CameraX —— 摄像头采集。
- MediaPipe Tasks Vision（Google）—— 端侧人脸与手部特征点检测。
- Google Play Billing（Google）—— 向 Google Play 查询订阅是否有效。
它们都不会代我们向任何地方发送数据，应用本身也未声明联网权限。
8政策变更
若本政策发生变更，我们会更新上方的「最后更新」日期，并在本页面发布修订后的版本。
9联系方式
如对本政策有疑问，请联系：leonpq1987@gmail.com