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
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。
- 车票、机票记录(日期、车次 / 航班号、起止站)
- 从文件夹 / 硬盘导入的足迹点(拍摄时间和位置)
- 设置,以及这台设备每天在哪的摘要(日期、城市、坐标)
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:
- 你选的类别、写的文字(最多 300 字)、是否愿意为这个功能付费
- 你主动附上的截图(最多 3 张,可以不附)。截图属于你主动提交的内容:只有你自己从相册里选了、并点了提交的那几张才会发出去,App 不会自动截图,也不会自己从相册取图。截图提交前会在手机上重新绘制并压缩,去掉拍摄时间、位置、设备型号等附带信息;画面里的内容会原样提交,请避开个人信息
- App 版本、系统大版本号(例如 26)、系统语言
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。
想删除提交过的愿望,请发邮件到 ,告诉我们提交的大致时间和内容,我们找到后删除。没有收到删除要求的,会保留到不再需要为止。
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
- 不上传、不分析你的照片画面(你在许愿池里主动提交的截图除外,见上文)。
- 不含广告、统计分析、崩溃上报等任何第三方 SDK,不追踪你。
- 不出售、不向第三方提供你的数据。
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
- 手机上的数据:删除 App 即全部清除。
- iCloud 里的同步数据:见上面「iCloud 同步」。
- 许愿池里提交过的内容:见上面「许愿池」。
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。
六、联系我们
对这份政策或你的数据有任何疑问,请发邮件到 。
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
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.
- Ticket records (date, train or flight number, stations or airports)
- Footprint points imported from folders or drives (capture date and location)
- Settings, and a per-day summary of where this device was (date, city, coordinates)
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:
- The category you chose, your text (up to 300 characters), and whether you would pay for the feature
- Screenshots you choose to attach (up to 3, optional). Screenshots are content you submit yourself: only the ones you pick from your library and then submit are sent. The app never takes screenshots on its own and never picks images from your library by itself. Before sending, each screenshot is redrawn and compressed on your phone, which removes the capture date, location, device model and other attached information. What is visible in the picture is sent as is, so please avoid personal information
- App version, major system version (for example 26), and system language
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.
To have a wish deleted, email with roughly when you submitted it and what it said, and we will find and delete it. Wishes with no deletion request are kept until they are no longer needed.
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
- It does not upload or analyze the content of your photos (other than screenshots you submit yourself in the Wish Pool, as described above).
- It contains no advertising, analytics, crash-reporting or other third-party SDKs, and it does not track you.
- It does not sell your data or give it to third parties.
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
- Data on your phone: deleting the app removes all of it.
- Synced data in iCloud: see iCloud sync above.
- Wishes you have submitted: see Wish Pool above.
5. Changes to this policy
When the policy changes, this page and the date at the top are updated.
6. Contact
Questions about this policy or your data: .