Official documentation
Undertekst privacy: your videos stay on your iPhone
Peter Theill, 2026
Read the originalRead on October 25, 2026
- What it is
- The privacy page of Undertekst, an iPhone app that writes subtitles into a video on the phone, by Peter Theill. It says that the video, its sound and its text stay on the iPhone and that deleting the app deletes the projects.
- How much weight it carries
- The developer's own privacy page, marked 'Updated 5 October 2026'. It describes the app as built and states no retention period in days. It does not mention whether anyone reviews content, and its statements cover the app's own design, not the services of Apple or Hugging Face that the app uses to download speech models.
Facts taken from this source
- Undertekst's privacy page says that if you delete the app, your projects are deleted too.
“If you delete the app, your projects are deleted too.” (Section 'No account and no tracking')
- Undertekst's privacy page says the video, its sound and its text are never sent anywhere.
“Videos, sound and text are never sent anywhere.” (Section 'Your videos stay on your phone')