关键帧 — Privacy Policy

Last updated: October 7, 2026
Effective: October 7, 2026

This policy covers "关键帧" (the "App").

In plain words: a tool for pulling still frames out of a video and extracting text from it.
Frame extraction runs on your iPhone. The "extract text" feature is the exception — it uses
Apple's speech recognition, which sends audio to Apple. That is spelled out below.

1. What we collect

Nothing.

• We do not upload your videos, the frames you extract, or the recognised text.
• We do not upload your usage history or settings.
• No analytics, no tracking, no advertising SDK.
• The App has no server of its own — nothing reaches us.

2. How the App handles your data

Extracting frames

• Only videos you explicitly select are read.
• Frame extraction and image export run entirely on your iPhone (using Apple's video frameworks).
• Results are saved where you choose, or to your library if you ask for that.
• Neither the process nor its results are uploaded, and nothing is written to a log.

Extracting text (please read before using)

• This feature uses Apple's built-in speech recognition (SFSpeechRecognizer, Chinese).
• Apple's default speech recognition sends the audio to Apple's servers for processing — that
  is how Apple's service works, not something we do.
• The developer receives neither your audio nor the recognised text.
• If you never use this feature, no audio is ever sent.
• If you are not comfortable with audio being sent to Apple, please do not use "extract text".

3. The only things that go online

• Speech to text (only when you actively use "extract text"): audio is processed by Apple's
  speech recognition service, as described above. This is the only feature that sends your
  content anywhere.
• App Store in-app purchase (unlocks the full feature set). Payment, receipts and refunds are
  handled by Apple. We never see your payment details and never receive your name or account.
• Before purchase the App checks network reachability once (a request to apple.com carrying
  no content).
• Beyond this the App makes no network requests.

4. Permissions

• Photo library (read): used to pick the videos you want to process.
• Photo library (write): used to save extracted frames, only when you ask.
• Speech recognition: used only by the "extract text" feature, to transcribe speech in a video.
• The App does not use the camera or microphone; it does not record or capture audio.
• You can revoke these at any time in Settings → Privacy & Security.

5. Third parties

The App includes no third-party analytics, advertising, or data-collection SDK. Any network activity involving Apple is itemised under "the only things that go online" above.

Apple's speech recognition service

• "Extract text" uses Apple's built-in speech recognition (SFSpeechRecognizer).
• By default that service sends audio to Apple's servers to perform recognition — please also
  review Apple's privacy policy.
• The developer does not receive or store that audio or the recognised text.

6. Your rights

• Delete in-app data: uninstall the App.
• Revoke permissions: iOS Settings → Privacy & Security → Photos / Speech Recognition.
• Delete saved images: remove them in the Photos app.

7. Contact

Questions? Please write to: gcdev@qq.com