Terms of Use & End-User Licence

1. Who these terms are with

These terms form an agreement between you (the "end user", "you") and Key for Business Pty Ltd, an Australian proprietary limited company and the publisher of Rabab Tuner ("we", "us", the "publisher" or "licensor"). They are not an agreement with Apple Inc., Google LLC, or any app store.

Publisher / licensor

Key for Business Pty Ltd (ACN 627 946 874), an Australian proprietary limited company.

Address for notices, questions, complaints and claims

Narre Warren VIC 3805, Australia

Email

[email protected]

Trader status

Key for Business Pty Ltd distributes the app as a trader for the purposes of EU consumer law and the Digital Services Act, as declared in App Store Connect and Play Console.

2. Acceptance

By downloading, installing or using the Rabab Tuner application, or by using this website, you agree to these terms. If you do not agree, do not install or use the app, and stop using this website. If you are under the age at which you can form a binding contract where you live, you may use the app only with the involvement of a parent or guardian who accepts these terms on your behalf.

3. Licence grant and scope

Rabab Tuner is offered with a free trial followed by a paid subscription (section 6). Subject to these terms and to your subscription being current, we grant you a personal, limited, non-exclusive, non-transferable, non-sublicensable, revocable licence to download, install and use the app:

on any device that you own or control, and — where the app store's rules allow it — on devices shared under a family-sharing or volume-purchase arrangement made available by that store;
for your own musical practice, teaching, study, recording and performance, including commercial performance and paid teaching. That is the intended use and no additional permission is needed;
in accordance with the usage rules of the store you obtained it from, which form part of this licence.

This is a licence, not a sale. All rights not expressly granted are reserved by us and our licensors.

4. Restrictions

You may not:

copy, reproduce or distribute the app, except as your device does automatically to install and run it;
decompile, reverse engineer, disassemble, decrypt or attempt to derive the source code of the app, except to the extent that applicable law expressly permits despite this limitation (including for interoperability, where the law provides for it);
modify, adapt, translate or create derivative works of the app;
rent, lease, lend, sell, sublicense, resell or otherwise commercially redistribute the app or any modified version of it;
remove, obscure or alter any copyright, trademark or attribution notice;
extract and republish the app's audio samples, photographic assets or bundled data files as your own material, or as part of another product or sample library;
use the app to develop a competing product by copying its interface, assets or data;
circumvent any technical limitation, or use the app in breach of the store's usage rules.

5. Acceptable use

Use the app lawfully and sensibly. In particular, when you use the Live Learn feature to record your own harmonium or tabla, you are responsible for making sure that recording is lawful and welcome in the space you are in — recording other people without their knowledge may be unlawful where you live. Do not use the app in a way that interferes with your device's other functions, or that infringes anyone else's rights.

6. Subscription, free trial and cancellation

Rabab Tuner is a subscription app. Here is exactly how that works.

The free trial

When you first install the app you get a two-month free trial of the complete app — every feature, with nothing held back and no card charged during the trial. The trial's exact length and terms are confirmed by the app store before you start it. If you cancel before the trial ends you are not charged at all. If you do not cancel, the trial rolls into a paid subscription automatically, at the price the store showed you.

What the subscription includes, and what it costs

One subscription covers the whole app: tuning, reference tones, the harmonium and tabla, Live Learn, noise removal, the practice monitor, raga practice, instrument care and the check-up. There is no second tier, no add-on to buy, no advertising and no feature sold separately. The current price, the billing period and any trial are shown to you by Google Play or the App Store, in your own currency, before you agree to anything — prices differ by country and can change, which is why they are quoted there rather than here.

Billing, renewal and cancellation

Payment is taken by Google Play or Apple, through the store account you already have. We never see or handle your card details.
The subscription renews automatically at the end of each period, at the then-current price, and keeps renewing until you cancel it.
Both stores charge for the next period shortly before the current one ends — Apple within 24 hours of the period ending — so cancel at least a day ahead if you do not want to renew.
You cancel in your store account, not with us, and you can do it at any time: Play Store → profile → Payments & subscriptions → Subscriptions; or on iOS, Settings → your name → Subscriptions. We cannot cancel it for you, and we will never make you email us to stop a subscription.
After cancelling you keep full access until the period you have paid for runs out. Nothing you created is deleted by cancelling — your instrument setups, recordings and history stay on your phone.
Refunds are handled by the store under its own policy, because the store is the seller. We have no ability to refund a store purchase, but tell us if something went wrong and we will help you put the request in.
If we ever change the price, the store will notify you and ask for your agreement before the new price applies. If you do not agree, the subscription simply ends at the next renewal.

If you do not subscribe

When a trial or subscription ends the app stops working and says so plainly. It will not quietly stop detecting pitch, nag you on every screen, or hide the fact that it needs a subscription. Anything you saved stays on your phone, and resubscribing brings it all back.

Your cancellation rights are not affected If you are a consumer in the EU or the UK you have a statutory right to withdraw from a distance contract within 14 days; note that this right can be lost once you begin using downloaded digital content, and the store will have asked you to acknowledge that at purchase. In Australia, the consumer guarantees under the Australian Consumer Law apply to the subscription and are not excluded by anything here or by the store's policy.

7. Accuracy and measurement disclaimer

Several features report estimates, and the app labels them as estimates on screen. Please treat them accordingly:

Pitch detection is an acoustic measurement affected by room noise, string condition, microphone quality and the physics of a decaying plucked string. It is a tool to tune by, not a calibration reference.
Stroke direction and timing in the practice monitor are statistical estimates from a model trained on your own playing. Expect occasional misreads and judge technique by trends rather than by single strokes.
Raga and maqam matching is a statistical estimate on a semitone grid, with quarter-tone degrees approximated. Your ear and your teacher are the final judges.
Instrument care values are model estimates from wood physics, not sensor readings, and the optional weather outlook describes outdoor conditions, which differ from your room. A hygrometer beside the instrument gives the real numbers.
Health check verdicts compare an instrument to its own earlier baseline and can be confounded by room changes, new strings or a different microphone. They are acoustic inference, not a luthier's inspection. If you suspect damage, consult a luthier.

You remain responsible for decisions you make about your instrument, including how far you turn a peg. Subject to section 9, we are not liable for damage to an instrument, for strings broken while tuning, or for any consequence of relying on an estimate the app presented.

8. No warranty

Except for rights that cannot lawfully be excluded (see section 20), the app and this website are provided "as is" and "as available", without warranties of any kind, whether express, implied or statutory, including any implied warranties of merchantability, fitness for a particular purpose, accuracy, quiet enjoyment or non-infringement. We do not warrant that the app will be uninterrupted or error-free, compatible with every device or operating-system version, or that defects will be corrected. Some jurisdictions do not allow the exclusion of certain warranties, so parts of this section may not apply to you.

9. Limitation of liability

To the maximum extent permitted by law, and except where liability cannot lawfully be limited, we will not be liable for any indirect, incidental, special, consequential, punitive or exemplary damages, or for loss of data, loss of profits, loss of goodwill, business interruption, or damage to instruments or equipment, arising out of or in connection with your use of, or inability to use, the app or this website — even if we have been advised of the possibility of such damages. Where liability cannot be excluded, our total aggregate liability for all claims is limited to the greater of the amount you paid for the app in the twelve months before the claim arose or AUD 50, or to the minimum permitted by applicable law if that is higher. Nothing in these terms excludes liability for death or personal injury caused by negligence, for fraud, or for any other liability that cannot lawfully be excluded.

10. Apple App Store additional terms

The following terms apply if you obtained the app from the Apple App Store, and are required by Apple. In the event of any conflict with the rest of these terms, this section prevails for App Store copies of the app.

(a) Acknowledgement

You and we acknowledge that this agreement is concluded between you and the publisher only, and not with Apple Inc. ("Apple"). The publisher, not Apple, is solely responsible for the app and its content. This agreement does not provide for usage rules for the app that conflict with the Apple Media Services Terms and Conditions, and the publisher acknowledges having had the opportunity to review those usage rules.

(b) Scope of licence

The licence granted to you for the app is a limited, non-transferable licence to use the app on any Apple-branded product that you own or control, and as permitted by the Usage Rules set out in the Apple Media Services Terms and Conditions, except that the app may be accessed and used by other accounts associated with you via Family Sharing or volume purchasing.

(c) Maintenance and support

The publisher is solely responsible for providing any maintenance and support services for the app, as specified in these terms or as required by applicable law. You and we acknowledge that Apple has no obligation whatsoever to furnish any maintenance and support services with respect to the app.

(d) Warranty

The publisher is solely responsible for any product warranties, whether express or implied by law, to the extent they are not effectively disclaimed. In the event of any failure of the app to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) for the app to you. To the maximum extent permitted by applicable law, Apple will have no other warranty obligation whatsoever with respect to the app, and any other claims, losses, liabilities, damages, costs or expenses attributable to any failure to conform to any warranty will be the publisher's sole responsibility.

(e) Product claims

The publisher, not Apple, is responsible for addressing any claims by you or any third party relating to the app or your possession and use of it, including: (i) product liability claims; (ii) any claim that the app fails to conform to any applicable legal or regulatory requirement; and (iii) claims arising under consumer protection, privacy or similar legislation, including in connection with the app's use of frameworks that access user data.

(f) Intellectual property rights

You and we acknowledge that, in the event of any third-party claim that the app or your possession and use of it infringes that third party's intellectual property rights, the publisher, not Apple, will be solely responsible for the investigation, defence, settlement and discharge of any such claim.

(g) Legal compliance

You represent and warrant that you are not located in a country that is subject to a U.S. Government embargo, or that has been designated by the U.S. Government as a "terrorist supporting" country, and that you are not listed on any U.S. Government list of prohibited or restricted parties.

(h) Developer name and address

Questions, complaints and claims about the app should be directed to: Key for Business Pty Ltd, Narre Warren VIC 3805, Australia, [email protected].

(i) Third-party terms of agreement

You must comply with any applicable third-party terms of agreement when using the app.

(j) Third-party beneficiary

You and we acknowledge and agree that Apple and Apple's subsidiaries are third-party beneficiaries of these terms, and that upon your acceptance of these terms, Apple will have the right (and will be deemed to have accepted the right) to enforce these terms against you as a third-party beneficiary of them.

11. Google Play additional terms

If you obtained the app from Google Play, the Google Play Terms of Service apply to your use of that store in addition to these terms, and Google's own refund, delivery and account policies govern your relationship with Google. Google LLC is not a party to this agreement and is not responsible for the app, its content, or any claim relating to it. Nothing in these terms limits any right you have under Google Play's own consumer protections, and to the extent these terms conflict with Google Play's Developer Distribution Agreement or Developer Programme Policies, those policies prevail as between us and Google.

12. Copyright notice

The following are the copyrighted work of the publisher, protected by Australian copyright law and by international copyright treaties, except where a third-party licence is listed in section 15:

the app's source code, including the C++ digital-signal-processing engine, the Dart application code, and the platform-native audio layers;
the user-interface design, layout, iconography, colour system, animation and interaction design;
all written text in the app and on this website, including feature descriptions, guidance, tour copy and these legal documents;
the instrument photography used in the app and in this website's screenshots, together with the derived cut-outs and overlay artwork;
the app icon and all promotional artwork;
the bundled data files, including the calibration constants, the stroke-model seed data and the accompaniment definitions, as compilations.

Audio recordings. Every Rabab audio sample in the app — the twenty-four recorded plucks across the nylon, steel and Bachi banks — and the four recorded tabla cycles were recorded by the publisher on the publisher's own instruments. No third-party recordings, commercial sample libraries or licensed loops are used anywhere in the app, and no third-party rights attach to them. Any audio the app generates from those samples remains our copyright; recordings you make of your playing, or of your own instruments through Live Learn, are entirely yours and we claim no rights over them and never receive them.

What you may do. You may reproduce screenshots of the app and short quotations from this website for the purposes of review, news reporting, criticism, teaching or commentary, with attribution to Rabab Tuner. Any other reproduction, adaptation, publication or redistribution of the app's code, assets or written content requires our prior written permission — which we are usually happy to give; just ask.

Traditional music. The tunings, taals, thekas, thaats, ragas, maqamat and naghma styles the app implements are part of the traditional musical heritage of Afghanistan, the Pashtun regions and the wider Hindustani and Middle Eastern traditions. We claim no ownership of that heritage. Our copyright extends only to our own particular expression of it in code, sound synthesis and text.

13. Copyright and IP complaints

We take attribution seriously. If you believe anything in the app or on this website infringes your copyright, trademark or other intellectual-property right, contact us at [email protected] with: your name and contact details; identification of the work you say is infringed; identification of the material in the app or on the site you are complaining about; a statement that you have a good-faith belief the use is not authorised; and a statement that the information in your notice is accurate. We will investigate promptly and remove or correct anything that should not be there. You may also raise a claim through Apple's or Google's own content-dispute processes.

14. Trademarks and naming

"Rabab Tuner" and the app icon are used as unregistered marks of this application. The words rabab, rubab, Katay, Bam, Zer, Shahtar, Bachi, naghma, lehra, taal, theka, thaat, raga and maqam are traditional musical terms in the public domain and are used descriptively; we claim no rights over them.

Apple, the Apple logo, iPhone, iPad and Mac are trademarks of Apple Inc., registered in the U.S. and other countries and regions. App Store is a service mark of Apple Inc. Google Play, Android and the Google Play logo are trademarks of Google LLC. Their appearance on this website indicates intended distribution channels only, and implies no endorsement by, sponsorship of, or affiliation with either company. All other trademarks named on this site or in the app, including those in section 15, belong to their respective owners.

15. Third-party licences

Rabab Tuner stands on open-source work, and it is a pleasure to credit it. Each component below is used under its own licence, whose full text is available at the linked project and is reproduced in the licence notice bundled with the app.

Component	Used for	Licence
Flutter & Dart	Application framework and rendering	BSD 3-Clause · Google
flutter_bloc / bloc	State management	MIT
equatable	Value equality for state objects	MIT
shared_preferences	Local key–value persistence	BSD 3-Clause
path_provider	Locating app-private directories	BSD 3-Clause
file_selector	Importing your own .wav loops	BSD 3-Clause
permission_handler	Microphone permission flow	MIT
audioplayers	Accompaniment and reference-tone playback	MIT
Google Oboe	Low-latency audio capture on Android	Apache 2.0
ONNX Runtime	On-device model inference	MIT · Microsoft
DTLN (breizhn/DTLN)	Two-stage noise-suppression model	MIT
Spleeter (Deezer)	Source-separation stems for instrument isolation	MIT, including model weights
Inter typeface	Website body text	SIL Open Font License 1.1
Sora typeface	Website headings	SIL Open Font License 1.1
Open-Meteo	Optional weather outlook API	Free API; weather data CC BY 4.0

If you believe an attribution is missing, incorrect or out of date, please tell us and we will correct it promptly. Where a licence requires its full text to accompany distribution, that text ships inside the app package.

16. Privacy

Our handling of data is described in the Privacy Policy, which forms part of these terms. In summary: the app collects no personal data, stores everything on your own device, and makes one optional network request that you initiate. Nothing in these terms grants us any right to your musical performances, recordings or data.

17. Updates, support and termination

We may release updates that add, change or remove features, and your app store may install them according to your settings. Support is provided on a best-effort basis by one developer, through the contact form or by email; we aim to respond within a few days. We may stop distributing or supporting the app at any time, in which case copies already installed continue to work for as long as your device and operating system allow. This licence ends automatically if you breach these terms; you may end it at any time by uninstalling the app. Sections 8, 9, 12 and 20 survive termination.

18. Changes to these terms

We may update these terms as the app develops. The version published on this page governs, and the version number and date at the top will change. Material changes will also be noted in the app's release notes. If you continue to use the app after a change takes effect, you accept the updated terms; if you do not accept them, uninstall the app.

1.1 — 27 July 2026

Added the Apple App Store additional terms required for a custom EULA, Google Play terms, publisher identity and trader details, a copyright-complaints process, expanded copyright and trademark notices, and Victorian governing law with Australian Consumer Law carve-outs.

1.0 — 27 July 2026

First published with app version 1.0.0.

19. Governing law, consumer rights and disputes

These terms are governed by the laws of the State of Victoria, Australia, and the Commonwealth of Australia, without regard to conflict-of-law rules. You and we submit to the non-exclusive jurisdiction of the courts of Victoria and the courts able to hear appeals from them.

Your consumer rights are not affected Nothing in these terms excludes, restricts or modifies any guarantee, condition, warranty, right or remedy that you have under the Australian Consumer Law or any other law that cannot lawfully be excluded. Our goods and services come with guarantees that cannot be excluded under the Australian Consumer Law. If you are a consumer in the European Union or the United Kingdom, you keep the mandatory rights of your country of residence, including your statutory rights in respect of digital content, and you may bring proceedings in the courts of that country. If you are a consumer elsewhere, the mandatory consumer law of your country of residence applies to the extent it cannot be excluded.

Before starting any formal dispute, please contact us — nearly everything is resolved faster by email. If you bought or downloaded the app through an app store, you may also use that store's own complaint and refund channels.

20. General

Entire agreement. These terms and the Privacy Policy are the whole agreement between you and us about the app, and replace any earlier understanding.
Severability. If any provision is found unenforceable, it is modified to the minimum extent necessary or severed, and the rest stays in force.
No waiver. Not enforcing a provision on one occasion does not waive it.
Assignment. You may not assign these terms. We may assign them as part of a transfer of the app to a successor, who must honour them.
Language. These terms are written in English; any translation is provided for convenience and the English version governs.
Headings. Headings are for convenience only and do not affect interpretation.

21. Contact

Licensing questions, permission requests, attribution corrections, copyright complaints or anything else legal:

Email: [email protected]
Contact form: rababtuner.com/contact.html
Post: Narre Warren VIC 3805, Australia