Duet iOS
Privacy
Duet collects nothing. It plays sounds and the files you pick, and everything it remembers stays on your iPhone.
Last updated 18 October 2026.
Nothing leaves your iPhone
Duet makes no network requests. It has no account, no analytics, no advertising, no tracking, no crash reporting, and no server run by me. The built-in sounds are part of the app.
Your audio files
You choose files with the system Files picker, which can include iCloud Drive and Google Drive. Duet plays them where they are and keeps a bookmark so it can find them again after a restart. It does not copy, upload, or analyse them. Files you put in Duet's own folder (On My iPhone, Duet) are listed automatically.
What Duet stores on the device
Your volume, the last disc you played, where you stopped in each file, the bookmarks to your files, and their titles, artists, and cover art so the list loads quickly. All of it stays in Duet's private storage on your iPhone.
What Duet does not collect
Duet does not collect names, email addresses, location, contacts, usage data, device identifiers, or advertising identifiers.
Deleting your data
Removing a file in Duet forgets its bookmark and saved position; the file itself is left alone. Deleting the app removes everything Duet stored, including anything in On My iPhone, Duet, so move those files elsewhere first if you want to keep them.
Children
Duet is not directed at children and does not knowingly collect information from anyone, of any age.
Support
For privacy questions, email hi@santiagoalonso.com. See also the Duet support page.