TetsubiPrivacy policy
Last updated 8 November 2026
In short: Tetsubi doesn't collect any information about you. There's no Tetsubi account, no analytics, no advertising and no tracking. We don't run any servers that your data passes through, so we never see your music, your listening or your login.
This policy covers the Tetsubi apps for iPhone and Mac, made by DEKIRU Ltd ("we").
Your Jellyfin server
Tetsubi connects straight to the Jellyfin server whose address you enter. That server is run by you, or by whoever gave you an account on it, not by us. Tetsubi sends it what it needs to work:
- your sign-in, to log in;
- requests for your library, album art and music;
- what you play, so the server's "Recently Played" list stays up to date;
- favourites you add or remove;
- your device's name (as set in your device's settings) and the app's name, so you can recognise it in the server's list of devices.
How that server stores this is up to its owner. Jellyfin's own privacy information is on jellyfin.org.
Artist information
To show "About the artist" on album pages, Tetsubi looks up the artist on three free, public services:
These requests include only the artist's name or MusicBrainz ID, and a label saying they come from Tetsubi. They don't include your name, your account or anything about your server. Like any website, these services can see your device's IP address.
What's kept on your device
- Your server address and sign-in token, kept in the Keychain, Apple's secure storage for passwords.
- Your settings, recent searches and cached album art.
- Albums you download.
This stays on your device. Signing out removes your sign-in. Deleting the app removes everything else.
Apple services
If you use Siri, Shortcuts, AirPlay or CarPlay with Tetsubi, Apple handles those under Apple's privacy policy. If you've chosen to share crash reports and app analytics with developers in your device's settings, Apple may pass us anonymous crash reports. These don't identify you.
Children
Tetsubi collects no personal information from anyone, including children.
Changes
If this policy changes, we'll update this page and the date at the top.
Contact
Questions about privacy? Email [email protected].