Privacy Policy

Overview

Session 練習室 ("the app") is built with privacy as a default. The app processes all audio and video entirely on your device and does not collect, store, or transmit any personal data to external servers. There is no account, no analytics, and no advertising.

Data We Do Not Collect

• No account or login required
• No analytics or usage tracking
• No crash reporting sent to third parties
• No advertising identifiers
• Your music and videos are processed on-device and are never uploaded anywhere

Media Access

The app touches your media only at your explicit request:

• Audio files you pick through the system file browser are copied into the app's own storage for practice
• Videos you pick through the system photo picker are imported without the app ever browsing your library
• Photo library write access is used only to save your exported audio or video back to Photos

This access is used exclusively within the app. No media is uploaded or shared.

On-Device Processing

All audio analysis — AI vocal separation, tempo (BPM) detection, key detection — plus time-stretching, pitch-shifting, and audio/video export are performed locally on your device using Apple's frameworks (AVFoundation, Core ML, Accelerate). No audio or video data is sent to any server.

Local Storage

The app stores the following on your device only:

• Your imported songs and their separated vocal/backing tracks
• Per-song practice settings (speed, key, loop points, bookmarks)
• Temporary files created during export, deleted automatically afterward

Deleting a song in the app, or deleting the app itself, removes this data.

Your Content

You choose which songs and videos to import, and you are responsible for having the right to use them. The app ships with no copyrighted content and never shares your files with anyone.

Contact

Questions about this policy? Email [email protected].