sun.apps / Twineye

Privacy Policy for Twineye

Introduction

Twineye ("we," "our," or "us") is a VR video player and spatial video converter for Apple Vision Pro, with spatial video conversion also available on Mac. This Privacy Policy explains how Twineye handles your information. In short: Twineye does not collect personal data. Your videos, audio and subtitles are processed on your device and are never sent to us.

Information We Do NOT Collect

Twineye does not collect, store, or transmit any personal data to us. We have no servers that receive data from the app.

• No Personal Information: We do not collect your name, email, contacts, or any identifying information.
• No Accounts: Twineye has no sign-up, login, or user accounts.
• No Analytics or Tracking: We do not use any analytics, advertising, or tracking SDKs, and we do not collect usage or behavioral data.
• No Device Identifiers: We do not collect device identifiers, advertising IDs, or diagnostic data.
• No Content Uploads: We never receive your videos, audio, subtitles, watch history, or server details.

When Twineye Uses the Network

Twineye connects to a network only in the two cases below, and only when you start them:

• Local network playback (SMB): When you add a server, Twineye connects over your local network to the Mac, PC or NAS you specify, so you can browse and play your own videos. Apple asks for your permission before Twineye can access your local network.
• Smart Subtitles model download: When you choose to download the Smart Subtitles models, Twineye downloads about 1.7 GB of model files from Hugging Face (huggingface.co). These requests contain no video, audio, subtitle, or personal data. As with any download, Hugging Face receives standard connection information such as your IP address, which it handles under its own privacy policy.

Video playback, spatial video conversion and Smart Subtitles do not need an internet connection otherwise.

How Twineye Accesses Your Videos

• You choose the video: You open videos from Photos, Files, or an SMB share you added. Twineye reads only the videos and folders you open.
• You keep the result: Converted spatial videos are saved where you choose, such as Photos or Files. You remain in full control of them.
• No uploads: Your videos, source or converted, are never uploaded to us or to any third party.

Local, On-Device Processing

1. Spatial video conversion: A depth model bundled inside the app estimates depth on your device. Twineye then synthesizes a stereoscopic video and encodes it in Apple's spatial video format (MV-HEVC).
2. Smart Subtitles: After the one-time download, speech recognition, voice activity detection and translation all run on your Vision Pro. The audio of the video you are watching is analyzed locally to create subtitles and is never recorded or sent anywhere. Twineye does not use your microphone.
3. Everything stays local: Nothing you watch, convert or subtitle is sent to a server.

Data Stored on Your Device

To make the app work, Twineye keeps the following data on your device only:

• Watch history and thumbnails so you can resume videos. You can hide them from the home screen or clear them with Clear Watch History in Settings.
• Favorite folders and playback settings, such as layout, projection and subtitle preferences.
• SMB servers you add. Passwords are stored in your device's Keychain and are used only to connect to that server. Removing a server from Twineye deletes its saved password.
• Smart Subtitles models and subtitles created for your videos. You can remove the models at any time in Settings → Smart Subtitles → Delete Models.

Data Sharing and Third Parties

We have no data to share because we do not collect any data. There is no data transmission, storage, or sharing with any third parties by us.

Third-Party Components

Twineye uses the following components. All of them run on your device and do not send your data anywhere:

• Bundled depth-estimation model for spatial video conversion.
• Smart Subtitles models, downloaded unmodified from Hugging Face when you choose: Whisper Turbo (speech recognition, MIT License), Silero VAD (voice activity detection, MIT License) and Hy-MT2-1.8B by Tencent (translation, Apache License 2.0). Sources and full license notices are listed in the app under Settings.
• Open-source media libraries, such as FFmpeg, used locally to play common video formats.
• Apple system frameworks such as AVFoundation, Core ML, Network and RealityKit.

Data Security

• No Servers: We do not maintain any servers, databases, or cloud storage for app data.
• Your Files Stay Yours: Source videos and converted spatial videos are stored only where you save them.
• Protected Credentials: SMB passwords are kept in the system Keychain, available only on that device.
• Security by Design: The most secure approach is not collecting data in the first place.

Your Privacy Rights

• Permissions: You can grant or revoke Twineye's access to Photos and to your local network at any time in your device Settings.
• Data Deletion: Because we do not collect any data, there is no personal data held by us to delete. You can clear watch history, delete the subtitle models and remove servers in the app; uninstalling the app removes its data from your device.

Children's Privacy

Twineye does not collect personal information from anyone, including children under 13 years of age.

International Data Transfers

We do not transfer your data, because we do not collect it. If you download the Smart Subtitles models, the files are served by Hugging Face, whose servers may be located outside your country.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. When we do:

• We will update the "Last Updated" date at the top of this policy.
• We will notify users of significant changes through app updates.
• Continued use of the app after changes constitutes acceptance of the updated policy.

Apple Privacy Requirements Compliance

This app complies with Apple's App Store Review Guidelines and privacy requirements:

• All media and local network access is user-initiated and used only for the feature you requested.
• No tracking or data collection occurs.
• All required permission descriptions are provided in the app.

Consent

By using Twineye, you consent to this Privacy Policy. If you do not agree with this policy, please do not use the app.

Summary for Apple App Store

Data Collected: None. Twineye does not collect any data.

Data Usage:

• Video playback, conversion and Smart Subtitles run on your device.
• Network use is limited to SMB servers you add and the optional model download from Hugging Face.
• No data sharing with third parties.
• No tracking or analytics.

User Control:

• You choose which videos to open, convert or subtitle.
• You can revoke Photos and local network access at any time in Settings.
• You can clear history, delete models and remove servers in the app, or uninstall it to remove all app data.

This privacy policy reflects Twineye's commitment to privacy through data minimization: your videos, audio and subtitles are processed on your device and never sent to us.