Terms of Use

1. Who We Are

The Service is operated by Jacky Rusly (“Celyris,” “we,” “us,” or “our”).

For questions about these Terms, contact us at [email protected].

2. Accepting These Terms

By creating an account, using the Service, downloading the app, starting a lesson, using a practice feature, or purchasing a subscription, you agree to these Terms.

If you do not agree to these Terms, do not use the Service.

If you use Celyris on behalf of an organization, church, school, family program, or other group, you represent that you have authority to accept these Terms for that organization, and “you” includes that organization.

3. Eligibility and Parental Consent

Celyris may be used by learners of different ages. If you are legally able to agree to these Terms yourself, you may use the Service on your own.

If you are under the age of majority where you live, you may use the Service only with permission from a parent or legal guardian.

If you are under 13, a parent or legal guardian must review and accept these Terms, provide consent for your use of the Service, and supervise or manage your account and subscription activity.

4. The Service

Celyris provides worship piano learning features, which currently include:

• Guided lessons, organized into modules and step-by-step lessons, with reading steps, note-finding and chord-finding exercises, and guided note sequences for chords, scales, and melodies
• Play-along, where a backing track plays while the current chord is displayed and the notes are highlighted on the on-screen keyboard, in portrait or full-screen landscape
• Practice items and daily practice, including practice players, a daily practice goal, and a day-streak counter
• A reference library of chords, scales, chord progressions, and accompaniment patterns, with playable audio examples
• A free-play on-screen piano, including a sustain option
• Optional external MIDI keyboard input, where your device and connected hardware support it
• Progress tracking, synced to your account across your devices
• English and Indonesian language support, and light/dark appearance

The Service is for learning, practice, and personal educational use. Celyris does not guarantee that you will achieve any particular musical result, pass an exam, perform at a specific level, or be able to play any song or style after using the Service.

Features described in these Terms, in the app store listing, or on our website may change, and some features depend on your device, operating system, hardware, network connection, or region.

5. Accounts and Sign-In

Some features require an account. Depending on your device and platform, you may sign in using:

• Email and password, with a one-time verification code sent to your email address
• Google Sign-In
• Sign in with Apple (iOS)

You agree to provide accurate account information and keep it current. Accounts are personal — do not share your account, credentials, or premium access with others.

You are responsible for maintaining the confidentiality of your login credentials and for all activity under your account. Sign-in tokens are stored in your device’s secure storage (iOS Keychain / Android Keystore); keep your device itself protected.

If you believe your account has been compromised, contact us at [email protected] and change your password if your account has one.

We may use verification codes, password reset codes, access tokens, rotating refresh tokens, login and resend attempt limits, request rate limits, and other security measures to protect accounts and the Service.

6. Account Deletion and Recovery

You may delete your Celyris account from within the app, or by contacting us at [email protected].

Grace period. When you request deletion, your account is scheduled for permanent deletion after a grace period (currently 7 days) rather than removed immediately. During that grace period you may cancel the deletion and restore your account by signing in again. Once the grace period ends, the account and its associated owned backend records — such as profile details, lesson and practice completion records, and subscription rows — are permanently deleted, subject to legal, security, billing, backup, and fraud-prevention retention needs.

Deleting your account does not cancel your subscription. Apple App Store and Google Play subscriptions must be cancelled through the store account settings you used to purchase them. Deleting your Celyris account while a subscription is still active does not stop future billing and does not entitle you to a refund for the remaining period.

After deletion completes, you may lose access to progress, streaks, premium status in Celyris, cached account state, and other account-based features, and this cannot be undone.

7. Subscriptions and Premium Features

Celyris offers a free tier and a paid premium subscription. Premium unlocks paid content, which may include premium lessons and modules, worship play-along content and backing tracks, premium practice items, the reference library, and future premium content updates.

Subscription plans (such as monthly and yearly), prices, billing periods, renewal terms, trials, and taxes are shown in the app or in the applicable app store purchase flow before purchase. Prices and available plans may vary by country, platform, currency, promotion, or store account.

Subscriptions are sold and billed by the platform where you purchase them — Apple App Store or Google Play — and purchase and entitlement status is processed through RevenueCat. We do not receive or store your full payment card number.

Unless cancelled before renewal, subscriptions renew automatically according to the terms shown by Apple, Google, or the applicable store at the time of purchase. You are responsible for managing and cancelling your subscription through the store account used for purchase.

If you cancel, your premium access generally continues until the end of the paid billing period, unless the applicable store, law, or a refund decision provides otherwise. If a subscription expires, is refunded, is charged back, is paused, or has an unresolved billing issue, Celyris may remove premium access.

Premium status is applied to your account by the store and RevenueCat, and may take a short time to appear or to be withdrawn after a purchase, renewal, cancellation, or refund. We run periodic reconciliation so that status converges even if a purchase notification is delayed or missed. You may also use the app’s restore purchases feature to ask the store and RevenueCat to restore eligible purchases; restoration depends on the store account, the RevenueCat status, and entitlement availability.

Refunds are handled by Apple, Google, or the applicable store according to their policies and applicable law. Celyris is generally unable to issue refunds directly for purchases made through app stores.

Premium content may change over time. We may add, remove, reorganize, update, re-record, or replace lessons, practice items, library entries, audio, modules, and features. If we materially reduce a paid feature during an active subscription, we will handle the change as required by applicable law and platform rules.

8. Downloads, Offline Content, and Device Storage

Lesson narration and backing tracks are private content. The app downloads them to your device for playback, using short-lived, signed download links tied to your authenticated session and, where applicable, your premium entitlement.

By using the Service you understand and agree that:

• Downloading lesson audio uses network data, which may incur charges from your mobile carrier
• Downloaded audio is stored in the app’s own storage on your device and uses device storage space
• Lessons are versioned; when a lesson’s content is updated, the app may re-download its audio
• Signed download links are personal, time-limited, and issued for in-app use only. You may not share, republish, proxy, automate, or reuse them outside the app, and you may not attempt to retrieve assets you have not been granted access to
• Uninstalling the app, clearing its data, or deleting your account removes downloaded content from the device

9. Safe and Responsible Use

Music practice involves sound and physical activity. You are responsible for using the Service safely:

• Hearing. Set your device or headphone volume to a safe level before starting a lesson or play-along, and take listening breaks. Prolonged exposure to loud audio can damage hearing
• Physical strain. Stop and rest if you feel pain, numbness, or discomfort in your hands, wrists, arms, neck, or back. Celyris is not a substitute for in-person instruction, physiotherapy, or medical advice
• Attention. Do not use the Service while driving, cycling, or doing anything else that requires your attention. Lessons keep the screen awake and may play audio for extended periods
• Supervision.Parents and guardians are responsible for supervising a minor’s use, volume levels, screen time, and purchases

If you have a medical condition that could be affected by practice, consult a qualified professional before using the Service.

10. License to Use Celyris

Subject to these Terms, Celyris grants you a limited, personal, non-exclusive, non-transferable, revocable license to access and use the Service for personal, non-commercial learning and practice.

You may not:

• Copy, sell, rent, lease, sublicense, redistribute, or commercially exploit the Service
• Download, extract, rip, record, share, publish, or redistribute Celyris lesson audio, backing tracks, images, text, lesson content, library content, or other assets except through normal in-app use and caching
• Use Celyris-provided lesson audio or backing tracks for public performance, broadcast, streaming, synchronization, sampling, training datasets, resale, or commercial production without our written permission
• Modify, reverse engineer, decompile, disassemble, or attempt to derive source code from the app or Service, except where applicable law allows it
• Circumvent premium gates, signed asset links, authentication, entitlement checks, security measures, rate limits, or other access controls
• Use automated scraping, crawling, credential stuffing, load testing, emulators or scripted clients, or similar tools against the Service without our written permission
• Interfere with, disrupt, damage, overload, or compromise the Service or related systems
• Falsify progress, streaks, completion records, purchases, or entitlement status
• Use the Service for unlawful, harmful, deceptive, abusive, infringing, or fraudulent purposes
• Share your account or subscription in a way that bypasses the intended personal use of the Service

All rights not expressly granted to you are reserved by Celyris and its licensors.

11. Celyris Content and Intellectual Property

The Service — including the app, software, design, lesson structure and sequencing, text, translations, exercises, practice flows, chord and pattern data, images, icons, audio, backing tracks, sound effects, branding, and other materials — is owned by Celyris or its licensors and is protected by intellectual property and other laws.

“Celyris” and related names, logos, and marks are our trademarks or brand identifiers. You may not use them without our written permission, except as allowed by law.

The app includes third-party and open-source materials under their own licenses, with attributions shown in the app’s Third-Party Credits screen. These currently include:

• Salamander Grand Piano V3 by Alexander Holm, licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0). The original samples have been modified, processed, trimmed, and converted for use in Celyris
• Icon fonts, licensed under the SIL Open Font License 1.1

Additional notices may appear in the app, the app store listing, or our documentation.

12. Performing and Sharing What You Learn

What you learn is yours to play. Nothing in these Terms restricts you from performing, in worship or elsewhere, the musical skills, chords, scales, progressions, and accompaniment patterns taught in the Service — general musical knowledge is not owned by us.

However, Celyris does not grant you any rights in third-party musical works. If a lesson references, is inspired by, or teaches you to play a song owned by someone else, you are responsible for obtaining any performance, streaming, reproduction, or synchronization licenses your use requires (for example, from your local rights organization or church licensing body).

The recorded material we provide — our lesson narration, sound effects, and backing tracks — remains covered by Section 10, and may not be used in performances, broadcasts, streams, or recordings without our written permission.

13. Your Content, Feedback, and Profile Information

The Service may allow you to provide information such as your name, email address, avatar from a sign-in provider, language and appearance preferences, account settings, support requests, or feedback.

You retain rights you have in information you provide. You grant Celyris a worldwide, non-exclusive, royalty-free license to use, host, process, reproduce, modify, display, and transmit that information as needed to operate, secure, support, and improve the Service.

If you submit ideas, suggestions, bug reports, feature requests, or other feedback, you allow us to use that feedback without restriction or compensation to you.

You represent that you have the rights needed to provide any information or feedback you submit and that it does not violate the law or the rights of others.

14. Third-Party Services

Celyris integrates with or relies on third-party services, which may include Google Sign-In, Sign in with Apple, the Apple App Store, Google Play, RevenueCat (subscriptions and entitlements), Sentry (crash and error reporting), email delivery providers, cloud hosting, databases and caching, content delivery and asset-signing providers, and device operating system features.

Your use of third-party services may be governed by their own terms, policies, fees, account rules, and privacy practices. Celyris is not responsible for third-party services, but we use them to operate and support the Service.

15. App Store Terms

If you downloaded Celyris from the Apple App Store, Google Play, or another app store, your use of the app is also subject to the applicable store terms and rules.

For Apple App Store downloads:

• The app is licensed, not sold, to you
• Apple is not responsible for providing maintenance or support for Celyris
• Apple is not responsible for claims relating to Celyris or your use of Celyris, including product liability claims, legal compliance claims, consumer protection claims, or intellectual property claims, except as required by applicable law
• Apple and its subsidiaries are third-party beneficiaries of these Terms as they relate to your use of the iOS app, and Apple may enforce those provisions against you
• You must comply with applicable third-party terms when using Celyris

If these Terms conflict with mandatory app store terms or applicable law, the mandatory app store terms or applicable law will control to the extent of the conflict.

16. Privacy

Our Privacy Policy explains how we collect, use, disclose, and protect information when you use Celyris.

By using the Service, you acknowledge that we process information as described in the Privacy Policy.

17. Availability, Updates, Maintenance, and Changes to the Service

We may update, modify, suspend, or discontinue all or part of the Service at any time. We may also impose limits on features, storage, downloads, signed asset requests, API requests, accounts, or access.

We may provide app updates to improve security, compatibility, reliability, or features. Some updates may be required: where an older app version is no longer supported or safe to run, the app may prompt or require you to update before continuing to use it.

We may place the Service into maintenance mode for planned or emergency work, and may show in-app announcements about availability, changes, or important notices.

The Service may also be unavailable because of outages, network issues, third-party service failures, app store issues, device limitations, or events outside our control. Content you have already downloaded may remain playable offline, but features that need the server — sign-in, progress sync, subscription status, and new downloads — will not work while you are offline.

Parts of the Service may be offered as early-access, beta, or preview features, which may be incomplete, may change, and may be withdrawn.

18. Termination

You may stop using the Service at any time.

We may suspend or terminate your access to the Service if we reasonably believe that:

• You violated these Terms
• Your account is being used fraudulently or unlawfully
• Your use creates security, legal, operational, or abuse risk
• We are required to do so by law, court order, app store rule, or third-party provider requirement
• Continuing to provide the Service is no longer commercially, technically, or legally practical

If your access is terminated, these Terms will still apply to prior use, payment obligations, intellectual property rights, disclaimers, limitations of liability, indemnity, dispute terms, and any other provisions that by their nature should survive.

19. Disclaimers

To the maximum extent permitted by law, the Service is provided “as is” and “as available.” Celyris disclaims all warranties, whether express, implied, or statutory, including warranties of merchantability, fitness for a particular purpose, title, non-infringement, accuracy, availability, reliability, and uninterrupted or error-free operation.

Celyris does not warrant that:

• The Service will always be available, secure, accurate, complete, or error-free
• Lessons, practice content, audio playback, timing or beat synchronization, MIDI behavior, progress tracking, streaks, or subscription status will always be uninterrupted or perfectly accurate
• Audio will behave identically on every device, operating system version, headphone, speaker, or connected accessory
• Any defects or errors will be corrected
• The Service will meet your expectations or produce specific learning results

Some jurisdictions do not allow certain warranty exclusions, so some of these disclaimers may not apply to you.

20. Limitation of Liability

To the maximum extent permitted by law, Celyris and its owners, directors, employees, contractors, affiliates, service providers, and licensors will not be liable for indirect, incidental, special, consequential, exemplary, or punitive damages, or for lost profits, lost revenue, lost data, lost progress, lost goodwill, business interruption, device failure, or unauthorized access, even if we have been advised of the possibility of those damages.

To the maximum extent permitted by law, Celyris’s total liability for all claims relating to the Service or these Terms will be limited to the greater of:

• The amount you paid to Celyris for the Service in the 12 months before the event giving rise to the claim
• USD $50

Nothing in these Terms limits liability that cannot be limited under applicable law.

21. Indemnity

To the extent permitted by law, you agree to defend, indemnify, and hold harmless Celyris and its owners, directors, employees, contractors, affiliates, service providers, and licensors from claims, damages, losses, liabilities, costs, and expenses, including reasonable attorneys’ fees, arising from or related to:

• Your use or misuse of the Service
• Your violation of these Terms
• Your violation of law or third-party rights
• Information, content, or feedback you provide
• Your unauthorized use of another person’s account, device, payment method, or credentials

22. Governing Law and Disputes

These Terms are governed by the laws of Indonesia, without regard to conflict-of-law rules.

You and Celyris agree that disputes relating to these Terms or the Service will be brought in the competent courts of Indonesia, except where applicable law gives you a right to bring claims elsewhere.

If you are a consumer, you may have mandatory rights under the laws of your country, state, or region. Nothing in these Terms is intended to limit rights that cannot be limited by contract.

Before filing a claim, you agree to contact us at [email protected] and try to resolve the dispute informally. We will try to do the same.

23. Changes to These Terms

We may update these Terms from time to time. If we make material changes, we will update the “Last updated” date and provide additional notice where required by law or appropriate for the change.

Your continued use of the Service after updated Terms become effective means you accept the updated Terms. If you do not agree, you must stop using the Service.

24. Language

These Terms may be made available in more than one language. If we provide a translation and there is a conflict between versions, the English version controls, except where applicable law requires otherwise.

25. Miscellaneous

These Terms, together with the Privacy Policy and any terms shown in a purchase flow, are the entire agreement between you and Celyris for the Service.

If any provision of these Terms is found unenforceable, the remaining provisions will remain in effect.

Our failure to enforce a provision is not a waiver of our right to enforce it later.

You may not assign or transfer these Terms without our consent. We may assign these Terms as part of a merger, acquisition, financing, reorganization, sale of assets, or by operation of law.

26. Contact Us

For questions, support, legal notices, or account requests, contact:

• Legal entity: Jacky Rusly
• Address: Jakarta, Indonesia
• Email: [email protected]