低头计时器 帮助与支持 · Help & Support
最后更新日期 / Last updated: 2026-09-08
中文
这个 App 是做什么的？
Tiltic - 低头计时器（以下简称"本 App"）用你已经戴着的 AirPods 里的运动传感器读头部俯仰角，在你低头超过设定角度、并且持续够久时，轻轻响一声。它测的是你的头向下低了多久，就这一件事。
支持哪些耳机？
已知可用：AirPods（第 3 代）、AirPods（第 4 代）、AirPods Pro（全部代次）、AirPods Max。
AirPods 2 及更早型号不具备本 App 需要的头部运动传感器。
真正说了算的是运行时检测：本 App 启动时会问系统这台设备能不能提供头部姿态数据，不能就直接告诉你，不会让你对着一个永远不动的角度干等。所以你的耳机在不在上面这个列表里，最终以 App 里的提示为准。
为什么第一次用必须先校准？
因为系统给出的俯仰角没有定义零点。系统文档没有说明「0 度」对应什么姿势，所以不存在一个"系统中立位"可以直接拿来用。本 App 要你先在自然坐姿下校准一次，把你自己的中立位记下来，之后所有角度都相对它计算。没校准就进主界面，等于显示一个没有参照的数字。
想重新校准：设置 →「重新校准中立位」，随时可以重来。换了耳机、或者觉得读数偏了，就重校一次。
为什么状态栏出现定位箭头？「正在播放」里为什么有这个 App？
因为常驻守护要留在后台。iOS 不允许一个普通 App 在后台一直读传感器，只有两条路：播放音频，或者使用定位。本 App 两条都做了，你在设置里选一条：
- 选「声音」：App 播放一段听不见的音频，系统的「正在播放」里会出现它
- 选「定位」：状态栏出现定位箭头。位置数据一个字都不用，只是借这个资格留在后台，见隐私政策
这两个代价在主界面的「成本栏」里一直看得见，不藏。哪条都不想要，就只在前台开着 App 用。
为什么中间断了一段？
系统把 App 挂起了，那段时间传感器数据没送到。本 App 不会假装它一直在，会如实告诉你漏了多久。看到中断变多，通常是保活方式被系统打断（比如另一个 App 抢走了音频通道）——可以在设置里换一条保活方式试试。
角度显示「—」是什么意思？
传感器此刻没有产生有效数字，本 App 就不显示数字。常见原因：耳机没戴上、耳机断连、音频路由被别的设备抢走、或者你躺下了（躺着时头部俯仰角失去意义）。
这是刻意的：宁可显示「—」，也不显示一个几秒钟前的旧角度。
锁屏上的实时活动卡片怎么消失了？
系统对实时活动有 8 小时上限，到点会自动结束它，之后锁屏上最多再留 4 小时。守护还在跑的话，App 会接着申请一张新的。
提示音听不见？
- 确认耳机还连着（角度显示「—」就是断了）
- 确认音量没有调到最低
- 本 App 的提示只有声音：不震动、不发通知横幅。这是刻意的选择，不是缺少功能
数据存在哪？会上传吗？
全部在你手机里，不上传。本 App 不联网，没有账号，开发者看不到你的任何数据。卸载 App 就全删了。详见隐私政策。
怎么反馈问题？
邮件：norvynzhang@gmail.com。说明你的 iPhone/iPad 型号、iOS 版本、耳机型号，以及出问题时屏幕上显示的是什么，我能少问一轮。
English
What does this app do?
Tiltic - Head Down Timer reads your head pitch angle from the motion sensors in the AirPods you are already wearing, and plays a quiet cue once you have been looking down past a threshold you set, for longer than you set. It measures how long your head has been down. That is the whole app.
Which headphones work?
Known to work: AirPods (3rd generation), AirPods (4th generation), AirPods Pro (all generations), AirPods Max.
AirPods 2 and earlier lack the head-motion sensor this app needs.
What actually decides is a runtime check: at launch the app asks the system whether this device can supply head attitude data, and tells you plainly if it cannot rather than leaving you watching an angle that never moves. So whether your headphones are on the list above, the app's own message is the final word.
Why does it force a calibration the first time?
Because the pitch angle the system reports has no defined zero. The system documentation never says which posture "0 degrees" corresponds to, so there is no system neutral to borrow. The app asks you to sit normally and calibrate once, recording your neutral position; every angle after that is measured against it. Skipping calibration would mean showing a number with nothing to compare it to.
To recalibrate: Settings → "重新校准中立位", any time. Do it again after switching headphones, or whenever the readings feel off.
Why is the location arrow in my status bar? Why is this app in Now Playing?
Because the guard has to stay alive in the background. iOS does not let an ordinary app keep reading sensors in the background; there are exactly two ways through: play audio, or use location. The app implements both, and you pick one in Settings:
- Sound: the app plays inaudible audio, so it shows up in the system's Now Playing
- Location: the location arrow appears in the status bar. None of the location data is used — the app only borrows the right to stay running. See the privacy policy
Both costs are shown permanently in the cost bar on the main screen rather than hidden. If you want neither, keep the app in the foreground while you use it.
Why is there a gap in the middle of a session?
The system suspended the app, and no sensor data arrived during that stretch. The app will not pretend it was running; it reports exactly how long it missed. Frequent gaps usually mean the keep-alive method was interrupted (another app taking the audio route, for instance) — try the other method in Settings.
What does "—" mean where the angle should be?
That the sensor is not producing a valid number right now, so the app shows no number. Common causes: the AirPods are not in your ears, they disconnected, another device took the audio route, or you are lying down (head pitch stops meaning anything horizontal).
This is deliberate: better a dash than an angle from several seconds ago.
My Live Activity disappeared from the Lock Screen
The system caps Live Activities at 8 hours and ends them automatically, after which the Lock Screen keeps it for up to 4 more hours. If the guard is still running, the app requests a fresh one.
I cannot hear the cue
- Check the AirPods are still connected (a "—" for the angle means they are not)
- Check the volume is not all the way down
- The cue is sound only: no haptics, no notification banner. That is a deliberate choice, not a missing feature
Where is my data, and is any of it uploaded?
All of it is on your device, and none of it is uploaded. The app does not use the network, has no accounts, and the developer cannot see any of your data. Deleting the app removes everything. See the privacy policy.
How do I report a problem?
Email norvynzhang@gmail.com. Include your iPhone/iPad model, iOS version, headphone model, and what was on screen when it went wrong; that saves a round trip.
联系 · Contact
说明 · Note
本 App 是一个计时与提醒工具，不提供医疗、诊断或治疗功能，角度读数不具有医学或临床含义。
This app is a timer and a reminder. It provides no medical, diagnostic, or therapeutic function, and its angle readings carry no medical or clinical meaning.