Barline Privacy Policy

1. Who this policy is for

This policy covers the Barline iPhone app. Our website is covered separately by the Mirentha privacy policy.

Barline is published by Mirentha Ltd (“Mirentha”, “we”, “us”), a company incorporated in England and Wales (company number 17207914), registered office 71–75 Shelton Street, Covent Garden, London, WC2H 9JQ. For anything in this policy, contact [email protected].

2. What Barline collects

Nothing. Barline does not ask you to create an account, does not ask for your name, email address or phone number, and contains no analytics, attribution, advertising or crash-reporting SDK of any kind. No data reaches us from the app, so we process no personal data in connection with your use of it.

The app carries no third-party code at all. Everything it does, it does with Apple's own frameworks, on the phone.

3. What the app stores, and where

Everything Barline holds is kept in the app's own private storage on your iPhone:

Your songs. When you import an audio file, Barline makes its own copy of it in the app's storage, so the song keeps working if you later move or delete the original. The original file is not changed. The copy is deleted when you delete the song from the library, or when you delete the app. Barline also keeps a fingerprint of each file's contents, so importing the same file again opens the song you already have rather than adding a second copy.

The map of each song. The result of the on-device analysis: the bar lines, beats, sections, tempo and key, together with any correction you make to the downbeat. Analysis runs once, on import, and the result is stored so the song opens instantly afterwards.

Your loops, markers and notes. Each saved loop's name, bars, speed, pitch and practice-ramp settings; each marker's label and bar; and the notes you type against a song.

Two settings and a flag. Your preferred count-in, your default speed, and whether you have seen the welcome screens.

The song's title and artist come from the file itself: the title and artist tags inside it where it has them, and otherwise its name (a file called Artist - Title is split into the two). They are read on the phone, not looked up anywhere, and you can edit both. Deleting the app removes all of the above from that device.

4. Choosing a file

Barline opens the iPhone's standard file picker, which runs outside the app and is operated by iOS. The app is handed only the files you choose, one or several at a time. It never gets a view of your other files, your music library or your photos, which is why iOS does not ask you for a permission.

If the file you pick lives in iCloud Drive and is not yet downloaded to the phone, iOS fetches it from your own iCloud Drive so the app can read it. That is a download from your account to your phone, handled by Apple; Barline uploads nothing anywhere.

Streamed songs from Apple Music, Spotify and similar services are copy-protected and cannot be imported. Barline can only work with audio files you have on the phone and have the right to use.

5. Analysis happens on the phone

The bars, beats, sections and key are found by Apple's on-device music analysis, which ships as part of iOS 27 and runs entirely on the handset. The audio is not sent to Apple, to us or to anyone else to be analysed. It can run in aeroplane mode.

6. What the app does not do

No network of ours. Barline contains no networking code. It makes no requests to any Mirentha server, because there isn't one, and it fetches nothing from the internet. The only connection it can open is to Apple's App Store, through Apple's StoreKit, for the subscription described in section 8. The Support, Privacy policy and Licence terms links in the app open mirentha.com in Safari, outside the app, where the Mirentha privacy policy applies.

No listening. Barline does not use the microphone and does not ask for it. When you correct the downbeat you tap a button in time with the song; nothing is recorded.

No location, no contacts, no tracking. The app requests none of these and contains no tracking permission request because it does not track.

7. Playing in the background

Barline keeps playing when the screen locks or you switch apps, so you can practise without the phone in your hand. To do that it registers as an audio app with iOS, and it tells the system what is playing so the song's title and artist, and the start and end times of the current loop, appear on the lock screen and in Control Centre with playback controls. That information is shown by iOS on your own phone; it is not sent anywhere.

8. Paying for Barline

Every feature works on the first three songs you import, for as long as you like. Importing a fourth asks for Barline Unlimited, a subscription that lifts the limit while it runs. Apple sells it and takes the payment, and records it against your Apple Account rather than against your phone. Apple's StoreKit tells the app only which plan is active, when the current period ends and whether it will renew. We never see your payment details, your billing address or your Apple Account, and the app holds no record of the subscription beyond what Apple provides.

Apple also processes your download as the operator of the App Store, and, if you have opted in to sharing analytics with developers, may give us anonymised, aggregated statistics such as crash counts and device types. That data comes from Apple, cannot identify you, and is governed by Apple's privacy policy.

9. Backups

Barline does not sync anything, and has no iCloud feature of its own. Its maps, loops, markers, notes and settings are ordinary app data on your phone, so if you use iCloud Backup or back up to a computer, they are included in that backup exactly as any other app's data is, and are restored onto a replacement phone. The copies of the audio you imported are deliberately left out of backups, because each is a full-size duplicate of a file you already have, so keep your originals. That is Apple's backup of your device rather than anything Barline does, and it is governed by your own iCloud and backup settings.

10. Children

Barline is not directed at children and collects no data from anyone, including children.

11. Your rights

UK GDPR gives you rights of access, rectification, erasure, restriction, portability and objection over personal data held about you. Because Barline sends us no personal data, we hold none in connection with the app, and there is nothing for you to access or erase with us. Deleting a song removes it and everything saved against it; deleting the app removes everything it held on that device. Anything of yours in an iCloud or computer backup is in your own account and managed by you.

If you email us about Barline, we hold your message and address in order to reply, on the basis of our legitimate interest in answering support enquiries; that is covered by the Mirentha privacy policy. You can ask us to delete the correspondence at any time at [email protected], and you have the right to complain to the Information Commissioner's Office: ico.org.uk/make-a-complaint.

12. Changes to this policy

If a future version of Barline ever collects anything, this policy will be updated before that version ships and the change will be described here rather than buried in a version number. The date at the top always reflects the current text.

13. Contact

Mirentha Ltd, 71–75 Shelton Street, Covent Garden, London, WC2H 9JQ, United Kingdom. Privacy questions: [email protected]. For help using the app, email [email protected] or see Barline support.