Privacy Policy
Sundial (晷) · Last updated: September 2026
Overview
Sundial helps you understand and manage how much time you spend on your iPhone. This policy explains what data the app uses and where it stays. By using Sundial you agree to the practices described here.
Data stays on your device
Sundial stores all of your screen time and limit data locally on your device. Nothing is uploaded to a server or shared with third parties. Your activity totals, health score, limits and settings are kept in the app's private storage and in the shared App Group container on your device.
Screen Time access
Sundial uses Apple's Screen Time framework (DeviceActivity and FamilyControls) with your explicit permission. With your consent the app reads your aggregate usage totals and can set app and category limits. This access is granted and controlled entirely by you in System Settings, and you can revoke it at any time. Sundial never sees the contents of your activity — not messages, not what you view or type — only aggregate usage time.
No tracking or analytics
Sundial contains no third-party analytics, advertising or tracking SDKs. We do not collect personal information, device identifiers, or usage data for marketing, and we do not track you across apps or websites.
Purchases
The optional one-time Pro purchase is processed by Apple. We never receive your payment details. Apple tells the app only whether the purchase is active, and that answer is stored on your device.
Your control
You can change or delete all of your data at any time — adjust limits, change the theme or background, or remove the app entirely to erase its data.
Children
Sundial is not directed at children under 13 and collects no personal information from anyone.
Changes
If this policy changes, the new version will be published on this page with a new date.
Contact
Questions about this policy: zuoxiaooo@icloud.com, or use Settings → Feedback in the app.
隐私政策
Sundial（晷）· 最后更新：2026 年 9 月
概述
晷帮助你了解并管理自己在 iPhone 上花费的时间。本政策说明 App 使用哪些数据、这些数据存放在哪里。使用晷 即表示你同意本政策所述的做法。
数据只留在你的设备上
晷把你全部的屏幕时间与限额数据保存在本机。不会上传到任何服务器，也不会提供给第三方。你的用时统计、健康 度、限额与设置都存放在 App 私有目录以及设备上的 App Group 共享容器中。
屏幕时间权限
晷在你的明确授权下使用 Apple 的「屏幕时间」框架（DeviceActivity 与 FamilyControls）。获得授权后，App 可以读取你的总计用时，并设置 App 与类别限额。该权限完全由你在「系统设置」中授予与控制，随时可以撤销。 晷永远看不到你活动的内容——不是消息，也不是你看了或输入了什么——只读取总计用时。
没有追踪与统计
晷不包含任何第三方统计、广告或追踪 SDK。我们不会为营销目的收集个人信息、设备标识或使用数据，也不会跨 App 或网站追踪你。
购买
可选的一次性 Pro 购买由 Apple 处理账单，我们不会获得你的支付信息。Apple 只会告知 App 该购买是否有效， 而这个结果保存在你的设备上。
你的控制权
你随时可以修改或删除全部数据：调整限额、更换主题或背景，或者直接删除 App 来清除数据。
儿童
晷并非面向 13 岁以下儿童，也不会向任何人收集个人信息。
变更
若本政策有变更，新版本会发布在本页面并更新日期。
联系方式
如对本政策有疑问，请邮件联系 zuoxiaooo@icloud.com，或使用 App 内的「设置 → 反馈」。