Prestosic — Privacy Policy
Effective: 6 November 2026 Applies to: all versions of Prestosic for iPhone and iPad (app identifier com.pengyao.prestosic)
Prestosic (“the app”) is developed by PENGYAO / PengYao to photograph or import printed sheet music, recognize it with on-device optical music recognition (OMR), and play it entirely on your device. The app is free and has no in-app purchases or ads. The app does not collect, store, upload, sell or share any personal data.
Opening in-app Privacy Policy or Support may fetch the latest hosted page over the network (China site → Cloudflare Pages → here.now), with a bundled offline copy as final fallback. Recognition and playback do not otherwise require a network.
1. Data the app handles
- Score images and PDFs you photograph or choose are read and processed only on your device. Recognition results and playback stay on the device and are never uploaded to any server.
- App settings (interface language, recognition accelerator preference, play-repeat preference, ask-before-edit after capture, highlight colour, and similar preferences) are stored only on your device (UserDefaults). They never contain photos or scores.
- Camera: used only when you choose to photograph printed sheet music. Photos do not leave the device.
- Choosing images or PDFs uses the system photo picker, the Files app, or the share extension; the app can access only the items you select. The app does not request full Photo Library access (no NSPhotoLibrary usage description).
- Share extension: when you share an image or PDF to Prestosic from another app (for example WeChat or Files), the extension copies it into the on-device App Group container (group.com.pengyao.prestosic). When you open the main app, the file is imported for recognition and removed from the shared inbox. No network is used for this path.
- The library of scores you keep in the app is stored only in the app’s sandbox on your device.
2. What we do not do
- No accounts or sign-in, and no personal information is requested.
- No analytics, advertising, IDFA, or third-party SDKs that phone home.
- No tracking.
- Recognition and playback work offline; no score data is sent to us or to any third party. The only web content the app may load is this Privacy Policy and the Support page when you open them (hosted page with bundled offline fallback).
3. Permissions
- Camera: requested when you tap the camera control, to photograph printed scores for on-device recognition and playback. Photos do not leave the device.
- Choosing existing images or PDFs uses the system picker / Files / share extension without full Photo Library access.
You can change or revoke camera permission at any time in Settings › Privacy & Security › Camera.
4. Data retention and deletion
No data is kept on any server. Temporary and library files on your device are managed by the app and the system; deleting the app removes all of its local data, including settings and saved scores.
5. Third parties
No data is shared with third parties. When you export or share a MIDI or score file, it is handed to the app you pick, whose own privacy policy applies. If you email us, your address is used only to reply to you.
6. Children
The app does not collect personal information from anyone, including children.
7. Changes
If this policy changes, the updated version will be posted at https://www.pengyaostudio.cn/prestosic/privacy.html and in the app, with a new effective date.
8. Contact
Email: 35309459@qq.com
「Prestosic」隐私政策
生效日期：2026 年 11 月 6 日 适用版本：iPhone / iPad 版 Prestosic 的所有版本（应用标识 com.pengyao.prestosic）
Prestosic（以下简称“本应用”）由 PENGYAO / PengYao 开发，用于拍摄或导入纸质乐谱，在本机进行光学乐谱识别（OMR）并演奏。本应用免费，无 App 内购买、无广告。本应用不收集、不存储、不上传、不出售也不分享任何个人数据。
打开应用内「隐私政策」或「技术支持」时，可能会联网获取最新托管页面（国内站 → Cloudflare Pages → here.now）；若无法打开，则自动改用随包离线页面。除此以外，识别与演奏功能不依赖网络。
1. 我们处理的数据
- 你拍摄或选择的乐谱图片与 PDF：仅在你的设备上读取和处理，识别结果与演奏均留在本机，不会上传到任何服务器。
- 应用设置：界面语言、识别加速偏好、演奏反复记号、拍照后是否询问编辑、高亮颜色等，只保存在设备本地（UserDefaults）。这些设置不包含任何照片或乐谱。
- 相机：仅在你选择拍摄纸质乐谱时使用；照片不会离开本机。
- 选择图片或 PDF：使用系统照片选择器、“文件”或分享扩展，只能访问你主动选中的内容。本应用不申请完整相册访问权限（无 NSPhotoLibrary 用途说明）。
- 分享扩展：你在其他 App（例如微信或“文件”）中把图片或 PDF 分享到 Prestosic 时，扩展将其复制到本机 App Group 容器（group.com.pengyao.prestosic）；打开主 App 后导入识别，并从共享收件箱删除。此过程不联网。
- 你保存在应用内的乐谱库仅存放在本应用沙盒中。
2. 我们不做的事
- 无账号、无登录，不要求填写任何个人信息。
- 不包含统计分析、广告、广告标识符（IDFA），也不包含会向外发送数据的第三方 SDK。
- 不追踪你。
- 识别与演奏可在离线完成，不会向我们或任何第三方发送乐谱数据。应用内唯一可能联网加载的网页内容，是你主动打开的本隐私政策与技术支持页（托管页 + 随包离线兜底）。
3. 权限说明
- 相机：在你点按拍照入口时请求，用于拍摄纸质乐谱以便本机识别并演奏；照片不会离开本机。
- 选择已有图片或 PDF：使用系统选择器 / “文件” / 分享扩展，无需完整相册访问权限。
你可以随时在“设置 › 隐私与安全性 › 相机”中更改或撤销权限。
4. 数据保留与删除
本应用不在服务器上保存任何数据。设备上的临时文件与乐谱库由应用和系统管理，删除本应用即会清除本应用的全部本地数据（包括设置与已保存乐谱）。
5. 第三方
本应用不与任何第三方共享数据。当你主动导出或分享 MIDI / 乐谱文件时，文件会交给你选择的目标应用，由该应用的隐私政策约束。通过邮件联系我们时，我们只会用你的邮件地址回复你的问题。
6. 儿童隐私
本应用不收集任何人（包括儿童）的个人信息。
7. 政策变更
如本政策更新，我们会在 https://www.pengyaostudio.cn/prestosic/privacy.html 和应用内发布新版本并更新生效日期。
8. 联系我们
邮箱：35309459@qq.com