Halftone
Halftone is an iPhone and Apple Watch app that shows your Apple Health and WHOOP records together. It's made by Mingyang He. This policy took effect on November 3, 2026.
Support
Questions or problems: jasonhmydeveloper@gmail.com
Privacy
Your health records stay on your device. We don't run a server that receives or stores them, and the app has no account or sign-in.
What the app reads
- Apple Health: the types you allow, such as sleep, heart rate, heart rate variability, steps, energy, body measurements, vital signs and workouts. It only reads, and never writes to Apple Health.
- WHOOP, if you connect it: your profile, recovery, sleep, cycles and workouts.
- Your name and photo, if you add them. They stay on your iPhone.
How it's used
Only to show you your records, trends and sources in the app, the widgets and on your Apple Watch. There is no advertising, data selling, tracking or third-party analytics. Your data isn't used for marketing or to train AI models.
Where it's kept
Records are saved in the app's encrypted storage on your iPhone and left out of iCloud backups. Your Apple Watch gets a short summary from your iPhone. WHOOP sign-in tokens are kept in the iPhone Keychain.
Who else is involved
- WHOOP: the app downloads your records directly from WHOOP after you authorize it. WHOOP's privacy policy covers its service.
- Our sign-in service (hosted on Vercel): it only exchanges and refreshes WHOOP sign-in tokens, because that needs a key that can't be kept in the app. It doesn't request or store health records, and it doesn't intentionally log tokens. The hosting provider's logs may keep request details such as IP address and time.
We don't share your data with anyone else.
Your choices and deleting data
- Apple Health: change permissions at any time in the system Health settings.
- WHOOP: disconnect in the app's Data Sources page, and choose whether to delete the WHOOP records on this iPhone. You can also revoke access in your WHOOP settings.
- Deleting the app removes the data it saved on your iPhone. We hold no copy to delete, so there is nothing to request from us.
Not medical advice
The app shows records. It isn't a medical device and doesn't diagnose or treat anything. Check with a doctor before making medical decisions.
Changes
If this policy changes, we'll update this page and the date above.
Halftone
Halftone 是一款 iPhone 和 Apple Watch App，把你的 Apple 健康和 WHOOP 记录放在一起看，由 Mingyang He 开发。本政策自 2026 年 11 月 3 日 起生效。
支持
有问题请写信到 jasonhmydeveloper@gmail.com
隐私
你的健康记录只留在你的设备上。我们没有接收或保存这些记录的服务器，App 也没有账号和登录。
App 读取什么
- Apple 健康：你允许的类型，比如睡眠、心率、心率变异性、步数、能量、身体测量、生命体征和训练。只读取，不写入 Apple 健康。
- WHOOP（你连接后）：个人资料、恢复、睡眠、周期和训练。
- 你填的名字和头像，只存在你的 iPhone 上。
用来做什么
只用来在 App、小组件和 Apple Watch 上给你看记录、趋势和来源。没有广告、数据出售、跟踪和第三方统计，也不会用你的数据做营销或训练 AI 模型。
存在哪里
记录存在 iPhone 上 App 的加密存储里，不进 iCloud 备份。Apple Watch 只从 iPhone 收到一份简短摘要。WHOOP 的登录令牌存在 iPhone 钥匙串里。
还有谁会参与
- WHOOP：你授权后，App 直接从 WHOOP 下载你的记录。WHOOP 的服务适用它的隐私政策。
- 我们的授权服务（托管在 Vercel）：只交换和刷新 WHOOP 登录令牌，因为这一步要用的密钥不能放进 App。它不请求也不保存健康记录，不主动记录令牌。托管平台的日志可能保留 IP 地址、时间等请求信息。
除此之外，我们不把你的数据给任何人。
你的选择和删除数据
- Apple 健康：随时可以在系统的健康设置里改权限。
- WHOOP：在 App 的数据来源页断开，并选择是否删除这台 iPhone 上的 WHOOP 记录。也可以在 WHOOP 设置里撤销授权。
- 删除 App 会清掉它存在 iPhone 上的数据。我们这边没有副本，不需要另外申请删除。
不是医疗建议
App 只显示记录，不是医疗器械，也不做诊断或治疗。做医疗决定前请先问医生。
更新
政策有变化时，我们会更新这个页面和上面的日期。