还差哪Left to Go

隐私政策

更新日期:2026 年 11 月 10 日

「还差哪」(英文名 Left to Go)读取相册里照片和视频的拍摄时间与位置,在你的手机上算出去过哪些地方,并生成旅行海报。这份政策说明 App 读取什么、数据存在哪里、什么情况下会离开你的手机。

先说结论
  • App 不会自己上传你的照片。足迹、旅程和统计都在你的手机上计算。唯一会发出去的图片,是你在「许愿池」里自己挑选并提交的截图。
  • App 没有账号,不需要注册或登录;没有广告、统计分析或任何第三方 SDK。
  • 数据只在三种情况下离开手机,都由你自己发起:打开 iCloud 同步(存进你自己的 iCloud,开发者看不到);在「许愿池」提交建议(开发者能看到你提交的内容);保存或分享海报。

一、只在手机上处理的数据

数据怎么用存在哪
相册里照片和视频的拍摄时间、位置判断每天在哪座城市,切出旅程,算出统计,生成海报。App 只读这两项信息,不分析照片画面分析结果只存在手机上
「那年今天」和「那天」页显示的照片在 App 和小组件里显示往年今天拍的照片;小组件只显示城市名,不显示精确位置缩略图存在手机上 App 自己的空间里
你主动导入的文件夹 / 硬盘 / 网盘里的照片和视频同样只读拍摄时间和位置,不拷贝文件每张只记拍摄时间和位置,不记文件名和路径
车票、机票(你拍的或从相册选的)在手机上识别,用来补上没有照片位置的那几天只记日期、车次 / 航班号、起止站;姓名和证件号不保存。用相机拍的票会存进系统相册的「还差哪 · 票据」相簿(默认先遮住姓名和证件号,可以在设置里关掉保存);从相册选的只是把原照片加进这个相簿
你在 App 里的设置(常住地、出差城市、旅程校准、海报文案、皮肤等)让统计和海报符合你的情况手机上

App 用到的系统权限:读取相册(读拍摄时间和位置、显示当天照片)、向相册添加照片(保存海报和票据)、相机(拍车票机票)。App 不申请定位权限,不读取你的实时位置。

二、数据会离开手机的情况

1. iCloud 同步(可选,默认关闭)

你在「同步与数据来源」里打开后,下面三类数据会存进你自己 iCloud 的私有空间,供你登录同一 Apple 账户的设备读取。这部分数据由 Apple 加密保管,开发者看不到。

三类可以分别关闭。照片本身、文件名、路径都不同步。关掉同步后不再写入;已经存进 iCloud 的数据,可以在系统「设置 → Apple 账户 → iCloud → 储存空间」里找到「还差哪」删除。

2. 许愿池(可选)

「许愿池」用来告诉开发者你想要什么新功能。只有你点了提交,下面的内容才会发出去:

这些内容存在开发者使用的 Apple iCloud(CloudKit)公共数据库里,只有开发者能查看,其他用户看不到。提交需要设备登录了 iCloud;开发者看不到你的 Apple 账户、姓名和邮箱,记录上只有一个由 Apple 生成的匿名编号;同一个 iCloud 账户提交的愿望带的是同一个编号,所以这些内容和这个编号相关联。这个匿名编号属于「用户 ID」,你附上的截图属于「照片」;两者都只用于实现许愿池功能,不用于追踪,不用于广告。

许愿池不会附带你的照片库、位置、足迹或旅程。内容只用于了解需求、改进产品,不用于广告或追踪,不提供给第三方。

如果你选择「改用邮件发送」,邮件由你自己的邮件 App 发出,开发者会收到你的邮箱地址和邮件内容。

3. 保存和分享海报

海报、年度报告和视频只有在你点「保存」或「分享」时才会存进相册或交给你选的 App。海报上的地点只到城市一级,不含精确位置。

三、App 不做的事

购买(年度会员、终身完整版)由 App Store 处理:付款、续订、退款都在 Apple 那里完成,「还差哪」不会拿到你的支付信息,也不会把你是否购买发给任何服务器。购买状态只由你设备上的 App Store 记录判断。

如果你在系统设置里同意「与 App 开发者共享」,Apple 会向开发者提供不含个人身份的崩溃和使用统计,这由 Apple 按它的隐私政策处理。

四、删除数据

五、政策更新

政策有变化时会更新这个页面和页面顶部的日期。

Privacy Policy

Last updated: November 10, 2026

Left to Go (Chinese name: 还差哪) reads the capture date and location of the photos and videos in your library, works out on your phone where you have been, and turns that into travel posters. This policy explains what the app reads, where data is kept, and when anything leaves your phone.

In short
  • The app never uploads your photos on its own. Footprints, trips and statistics are computed on your phone. The only pictures that are ever sent are screenshots you pick and submit yourself in the Wish Pool.
  • There is no account, sign-up or sign-in. There are no ads, no analytics and no third-party SDKs.
  • Data leaves your phone in only three cases, each started by you: turning on iCloud sync (stored in your own iCloud, not visible to the developer); submitting a wish in the Wish Pool (the developer can see what you submit); saving or sharing a poster.

1. Data processed only on your phone

DataHow it is usedWhere it is kept
Capture date and location of photos and videos in your libraryTo work out which city you were in each day, group days into trips, compute statistics and make posters. The app reads only these two fields and does not analyze what is in the pictureResults stay on your phone
Photos shown in On This Day and the day pageShown in the app and the widget for this date in earlier years. The widget shows only the city name, never a precise locationThumbnails are kept in the app's own storage on your phone
Photos and videos in a folder, external drive or cloud drive that you choose to importOnly the capture date and location are read; files are not copiedOnly the date and location of each item; no file names or paths
Train and flight tickets (photographed or picked from your library)Recognized on your phone, to fill in days that have no photo locationOnly the date, train or flight number, and the two stations or airports. Names and ID numbers are not stored. Tickets you photograph are saved to an album named "还差哪 · 票据" in your photo library (names and ID numbers are masked by default; saving can be turned off). Tickets picked from your library are only added to that album
Your settings (home, business cities, trip corrections, poster text, skin and so on)To make the statistics and posters fit youOn your phone

System permissions the app uses: photo library (read dates and locations, show the day's photos), add to photo library (save posters and tickets), and camera (photograph tickets). The app does not ask for location permission and never reads your live location.

2. When data leaves your phone

iCloud sync (optional, off by default)

If you turn it on under Sync & Data Sources, the three kinds of data below are stored in the private area of your own iCloud so that your other devices signed in to the same Apple Account can read them. Apple keeps this data encrypted and the developer cannot see it.

Each kind can be turned off separately. Photos, file names and paths are never synced. After you turn sync off nothing more is written; data already in iCloud can be deleted in Settings → Apple Account → iCloud → Storage, under this app.

Wish Pool (optional)

The Wish Pool lets you tell the developer which feature you would like next. The following is sent only when you tap submit:

This is stored in the public database of Apple iCloud (CloudKit) used by the developer. Only the developer can view it; other users cannot. Submitting requires the device to be signed in to iCloud. The developer cannot see your Apple Account, name or email address; a record carries only an anonymous identifier generated by Apple. Wishes submitted from the same iCloud account carry the same identifier, so this content is linked to that identifier. This anonymous identifier counts as a “user ID”, and any screenshots you attach count as “photos”; both are used only to run the wish feature, never for tracking or advertising.

A wish never includes your photo library, locations, footprints or trips. It is used only to understand what people need and to improve the app. It is not used for advertising or tracking and is not given to third parties.

If you choose to send by email instead, the message is sent by your own mail app, and the developer receives your email address and the message.

Saving and sharing posters

Posters, yearly reports and videos are saved to your library or handed to the app you pick only when you tap Save or Share. Places on a poster are shown at city level only, never as a precise location.

3. What the app does not do

Purchases (the yearly membership and the lifetime full version) are handled by the App Store: payment, renewal and refunds all happen with Apple. Left to Go never receives your payment information and does not send whether you have purchased to any server; the purchase status is determined only from the App Store records on your device.

If you have agreed to Share With App Developers in system settings, Apple provides the developer with crash and usage statistics that do not identify you, handled under Apple's own privacy policy.

4. Deleting data

5. Changes to this policy

When the policy changes, this page and the date at the top are updated.