KLASSIAN

Klassian Terms of Service

Effective date: August 19, 2026 These Terms replace the version dated June 26, 2026.

Klassian is operated by Elkanah (sole proprietor: Kyujin Cho), Business Registration No. 322-29-01953, Rm B211-11, Glocal Industry-University Cooperation Hall, Dankook University, 152 Jukjeon-ro, Suji-gu, Yongin-si, Gyeonggi-do 16890, Republic of Korea. Contact: support@klassian.com. In these Terms, "we" and "us" mean Elkanah.

In short. Klassian is a tool for reading and organising sheet music you already own. Your scores and annotations stay on your device and in your own iCloud — not on our servers. Subscriptions are billed by Apple. You keep every right you have under the consumer law of the country you live in.

1. What these Terms cover

These Terms govern your use of the Klassian app and related services. Your purchase of a subscription through the App Store is additionally governed by Apple's own terms, and the app itself is licensed to you under Apple's Standard End User License Agreement.

2. Definitions

  • Content — anything you add or write in the app: sheet music, annotations, events, recordings, notes.
  • Paid plans (Pro / Max) — features provided by subscription.
  • Group — a shared space you create with others to coordinate schedules.

3. Changes to these Terms

We may change these Terms where the law permits. We will give notice at least 7 days before a change takes effect, or 30 days if the change is to your disadvantage. If you do not accept a change, you may stop using the service and delete your account.

4. Your account

  1. Using Klassian without an account. You can use the core app — reading and annotating your scores — without signing in. In that case your data stays on your device and in your own iCloud, and nothing is sent to our servers. Downloading and using the app means you accept these Terms.
  2. Creating an account. Features that need an account, such as group collaboration, require signing in with Apple or Google. You accept these Terms and our Privacy Policy at sign-up.
  3. You are responsible for keeping your account details accurate and your account secure.
  4. Age. You must be at least 14 to create an account, or older where the law of your country requires it (16 in several EU countries). We ask you to confirm your age at sign-up.

5. The service and plans

Klassian is offered as Free, Pro, and Max. What each plan includes, and its price, is shown on the purchase screen in the app and on our website. We may improve or change the service; where a change is materially to your disadvantage, we will give notice under §3.

6. Subscriptions, billing, renewal, cancellation, refunds

  1. Apple handles all payments through the App Store. We never receive your payment details.
  2. Free trial. Where offered, the length and conditions are shown on the purchase screen. A free trial is available once per subscription group — if you have already used one, it will not be offered again.
  3. Automatic renewal. Your subscription renews automatically at the end of each period unless you cancel, and the renewal price is charged then. Apple notifies you of the timing and amount in advance.
  4. Cancelling. You can cancel at any time in Apple's subscription settings on your device. You keep access until the end of the period you have already paid for.
  5. Refunds are handled under Apple's policies and procedures. Nothing in this section limits any statutory right you have — including the right of withdrawal under EU/UK consumer law — under the law of the country where you live.
  6. Price changes. If we raise a subscription price, Apple gives advance notice, and existing subscribers are not charged the higher price without their consent.

7. Your content and copyright

  1. What we do. Klassian is a tool for viewing and organising sheet music you already have the right to use. We do not supply, sell, or broker sheet music. We cannot review what you put in the app, and we have no obligation to do so.
  2. What you are responsible for. You are solely responsible for the legality of your content and for holding the rights to it. Use only material you own or are permitted to use, and do not use or distribute material that infringes anyone else's rights.
  3. Where it lives. We do not store your scores, annotations, or recordings on our servers (§8). We therefore have no way of knowing what content you hold.
  4. Organisations and institutions. Where an organisation distributes sheet music to its members or uses it collectively, that organisation is responsible for obtaining the necessary licences.
  5. Rights we do not take. For the information you share in a group (event titles, notes, venues, comments), we store and transmit it only as far as providing that feature requires. We acquire no other rights in your content, and we do not use it for advertising, machine learning, or promotion.

8. Where your data is stored

  1. Your scores, annotations, personal calendar (including fee and settlement records), and practice history are stored on your device and in your own iCloud — not on our servers. iCloud sync is on by default and can be turned off in the app's settings.
  2. Recordings of your playing are excluded even from iCloud sync and stay on the device only.
  3. You are responsible for keeping your own backups. We are not liable for data lost through device loss, device reset, or insufficient iCloud storage.
  4. Our Privacy Policy explains this in full.

9. Groups

  1. Events, polls, and comments you create in a group are visible to that group's members. You are responsible for having the right to share what you share.
  2. Scores and annotations are not shared to groups. Groups exist for scheduling and coordination; we provide no means of exchanging sheet music.
  3. If you leave a group, what you wrote stays with the group and your name is replaced with "a former member", so that the others can keep using their schedule.
  4. If the person who created a group leaves or deletes their account, ownership passes automatically to another member and the group continues. If no members remain, the group is deleted (§13).

10. Reporting infringement

  1. If you believe your rights have been infringed, write to support@klassian.com, including enough detail to identify the material and your rights in it.
  2. On a valid report we act without delay — blocking access to or removing the material. For content that is not stored on our servers (§8), we act by requiring the user concerned to delete it and by taking action on their account.
  3. Accounts that repeatedly infringe the rights of others may be restricted or suspended.
  4. We never encourage or facilitate the unauthorised copying or distribution of anyone's work.

11. Gaze tracking — what to expect

  1. Gaze page-turning is an assistive feature whose accuracy varies with your camera, lighting, posture, instrument, and individual differences.
  2. We do not guarantee perfect accuracy in every setting. For performances, auditions, and examinations, we recommend keeping another method — such as tapping — available.
  3. The feature requires a device of a certain specification; supported devices are listed in the app and on our website.
  4. Our liability for consequences of the feature not working as expected is limited to the extent the law allows.

12. What you must not do

  1. Use or share content that infringes the rights of others, or use the service for unlawful purposes.
  2. Copy, reverse-engineer, or circumvent the service; access it by automated means; or attempt to breach its security.
  3. Impersonate another person or register false information.
  4. Interfere with the normal operation of the service.

13. Deleting your account, and ending these Terms

  1. You can delete your account at any time in the app's settings.
  2. Deleting your account immediately removes your account, profile, notifications, and usage records from our servers.
  3. Groups you created are not deleted — ownership passes automatically to another member and the group continues. If no members remain, the group is deleted with your account.
  4. Events, polls, and comments you wrote in a group stay with the group, re-attributed to "a former member." They are shared records the other members rely on; the link to you is removed. If you would like the content itself deleted, write to support@klassian.com.
  5. Deleting your account does not delete anything on your device or in your own iCloud. Remove it yourself if you wish.
  6. Subscriptions are separate: cancel in Apple's subscription settings. Deleting your account does not cancel a subscription.
  7. A subscription ending has no effect on group ownership, on what you have written, or on whether a group continues.
  8. We may restrict your use or terminate these Terms if you breach them materially — with notice beforehand, or afterwards where the matter is urgent.

14. Liability

  1. The service is provided "as is" to the extent the law allows.
  2. We are not liable for loss caused by events beyond our reasonable control, including force majeure and failures of third-party services (authentication, hosting, notifications).
  3. Nothing here limits our liability for wilful misconduct or gross negligence, for death or personal injury, or for anything else that cannot be limited under the applicable law.

15. Contact

Support and copyright reports: support@klassian.com

16. Governing law and disputes

  1. These Terms are governed by the laws of the Republic of Korea.
  2. We will try to resolve any dispute with you directly. Failing that, claims may be brought before the courts having jurisdiction under Korean civil procedure law.
  3. If you are a consumer resident outside the Republic of Korea, nothing in this section deprives you of the protection of the mandatory consumer law of your country of residence, or of your right to bring proceedings in the courts of that country.