Terms of Use for Granular Volume

Last updated: October 4, 2026

These Terms of Use ("Terms") govern your use of the Granular Volume mobile application ("the app"), developed and published by an independent developer (Rotem Zussman, "the developer"). They also govern the optional full-range unlock, and the optional companion application Volume Control Full Range Key ("the Key App"), both described in Section 5.

By installing or using the app or the Key App, you agree to these Terms. If you do not agree, do not install or use them. The app also asks you to actively accept these Terms on a consent screen before it first runs. The app's upgrade screen, which leads to the purchase, states again that upgrading means agreeing to these Terms. Either form of acceptance is sufficient; together they are the record that you agreed.

1. What the app does

The app is a software utility that provides fine-grained, software-level control of your Android device's volume, including steps below the device's built-in minimum volume, through a small floating on-screen control. It processes your device's audio output locally, on the device.

The audible effect of the app depends on your device. Android devices differ in how they route and process audio. Some sound types are handled in hardware or in audio paths that no application of this kind can reach: for example, regular cellular call audio on every phone, call audio from apps on some phones, and system interface sounds on all phones. The app applies its attenuation to the device's standard mixed audio output. It does not and cannot guarantee an identical audible result on every device, audio route, or sound type.

2. Not a medical device or safety equipment

The app is a convenience utility only. It is not a medical device, is not hearing protection equipment, and is not a substitute for professional medical advice, diagnosis, or treatment of any hearing or other condition. Actual loudness depends on your device's operating system, your audio hardware, your headphones or speakers, and the content you play. You remain solely responsible for choosing listening levels that are safe for you.

BY USING THE APP, YOU ACKNOWLEDGE AND ACCEPT THE RISKS INHERENT IN AUDIO PLAYBACK ON A MOBILE DEVICE, INCLUDING THE POSSIBILITY OF UNEXPECTED OR INCORRECT VOLUME BEHAVIOR CAUSED BY OPERATING SYSTEM CHANGES, DEVICE HARDWARE, OR SOFTWARE DEFECTS. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE DEVELOPER IS NOT LIABLE FOR HEARING-RELATED DISCOMFORT, INJURY, OR OTHER HARM ARISING FROM YOUR USE OF THE APP OR FROM UNEXPECTED AUDIO OUTPUT. THIS SECTION DOES NOT LIMIT ANY LIABILITY THAT CANNOT BE LIMITED OR EXCLUDED UNDER THE LAW OF YOUR COUNTRY OF RESIDENCE, INCLUDING LIABILITY FOR DEATH OR PERSONAL INJURY CAUSED BY NEGLIGENCE WHERE SUCH A LIMITATION IS NOT PERMITTED.

The app can lower sounds you may be relying on to alert you, including ringtones, notifications and alarms, down to a level you may not hear, and its mute button silences media entirely. If the control was active when your device shut down, it resumes at the same level after a restart. Do not rely on a device running the app as your sole means of receiving time-critical or safety-critical alerts, such as waking up for an obligation, incoming emergency calls, or medical or caregiving alerts. To the maximum extent permitted by applicable law, the developer is not liable for any loss or harm arising from a sound you did not hear, or heard at reduced volume, while the app was active.

3. License

The app's source code is free software, licensed under the GNU General Public License version 3.0 (GPL-3.0), available at github.com/Rzuss/granular-volume. Nothing in these Terms limits, replaces, or overrides any right you have under the GPL-3.0 with respect to the source code. These Terms govern your use of the compiled applications as distributed through Google Play or F-Droid, to the extent they do not conflict with that license.

Because the source code is licensed under the GPL-3.0, you are free to study, modify and build it yourself, including without the paid unlock described in Section 5, and nothing in these Terms restricts that. What these Terms do prohibit is narrower and unrelated to that freedom: redistributing the Key App itself, and presenting a modified build as an official release of the developer.

The apps also include third-party open-source components, each governed by its own licence. Those licences continue to apply to those components. The developer gives no warranty in respect of them beyond what this document states about the apps as a whole. A list of the components and their licences is available inside the app from version 1.5.0.

4. Trademarks and branding

The apps' names, logos, and store presence identify the developer's own builds. The GPL-3.0 license to the source code does not grant a license to use the apps' names or branding on derivative works in a way that suggests they are the developer's official releases.

5. The free trial and the full-range unlock (Google Play version only)

The Google Play version of the app is free to download and comes with a free trial of the complete app. When the trial ends, continuing to use the app's volume control requires a one-time purchase, described below. Installations made before this changed are not affected; see "Long-time users" below.

• The free trial. A new installation includes seven days of the complete app, with every feature available and nothing withheld. The seven days run from when the app is first installed on the device, whether or not you open it. If you first open the app after those seven days have already passed, you get 24 hours of the complete app from that first opening, once (version 1.7.0 and later). The app shows you how much time is left as the end approaches.
• What happens when the trial ends. The volume control stops applying changes until the unlock described below is bought. A control that is running at that moment keeps the level it has until it is next stopped or the device restarts, and nothing becomes louder or quieter by itself; changing that level on the dial needs the unlock. From the next time the control starts, other than a restart caused by an update of the app itself, it applies no attenuation, so any quiet level you were using is released and sound returns to your device's own volume. The app itself keeps working, remains installed, and takes nothing away from your device. Your device's own volume controls are unaffected at all times, both during the trial and after it. If you decide the app is not for you, uninstalling it is enough. There is nothing to cancel, because nothing was ever charged and nothing renews.
• One trial per device. The trial is intended to be taken once. So that it survives a new phone or a reinstall rather than being lost, the app records when your trial began in a small file that takes part in Android's own backup to your Google account, described in the Privacy Policy. That record is also what carries the free access of a long-time user to a new device. It contains no personal information, and the developer neither receives nor stores it.
• What you buy. The unlock keeps the app's volume control working after the trial: the normal range, the deeper steps and mute. The unlock button in the app opens Google Play's own purchase window, at the price displayed there in your local currency before you confirm; this is an in-app purchase through Google Play's billing system. Until September 28, 2026 the same unlock was also sold as a separate companion application, Volume Control Full Range Key. It is no longer offered to new buyers. A Key App bought earlier keeps unlocking the app in every version from 1.5.0; its own function is to serve as this unlock and to display its status, and it requires the app to be useful. If you own the Key App, you do not need to buy anything else: the app tells you that the full range is already open.
• One-time, not a subscription. The unlock, and the Key App sold earlier, are standard Google Play one-time purchases. There is no recurring charge, no subscription, and nothing to cancel.
• How it is processed. The purchase is collected and processed entirely by Google Play under Google's own terms of service and payments policies. The app never handles your payment details: the in-app route shows Google's own purchase window, and the Key App sold earlier was a purchase from Google Play's store listing.
• The purchase is personal to you. It is tied to the Google account that made it. It is not a transferable licence, and it may not be sold, lent or passed to another person separately from that account.
• Restoring the purchase. To restore the unlock on a new device, after a reset, or after reinstalling, sign in to Google Play with the same Google account that bought it. An in-app unlock comes back by itself when the app starts, or through the "Restore" link on the app's access screen; a Key App bought earlier is installed again from your Google Play library. Google Play recognizes the previous purchase and will not charge again. No account with the developer, no code, and no internet access in the app are involved.
• If the purchase is refunded or the Key App is removed. A refund of the in-app unlock through Google Play, or uninstalling the Key App, including when Google Play removes it after a refund, returns that device to the state it was in after the trial ended. That does not apply while the trial is still running, or if the device qualifies as a long-time user. Any quiet level that was in use is then released the next time the control starts.
• Device dependence. The unlock keeps the volume control working as described, including the additional attenuation steps. As stated in Sections 1 and 2, the audible effect of any step depends on your device's audio hardware and software. The developer does not warrant a specific audible outcome on a specific device, audio route, or sound type.
• If a purchase route stops being offered. The developer may stop offering the Key App, or the in-app unlock, for sale at any time. If that happens, a purchase already made remains valid, and Google Play's own record of your purchase is what restores it. The developer does not operate any separate licence service and cannot restore a purchase independently of Google Play.
• If something does not work. If a feature you paid for does not behave as described, please contact the developer first and allow a reasonable period to investigate and fix it. Most problems of this kind are configuration or device-routing issues that can be resolved quickly. This is a request for the chance to put things right, not a condition on your rights. It does not limit any statutory remedy you have, and it does not affect your ability to seek a refund at any time.
• Refunds. You may request a refund through Google Play's standard refund process, or by contacting the developer directly at the email address below. Statutory rights you have under the consumer-protection law of your country of residence, including any right of withdrawal, are not affected by these Terms. If you are a consumer in Israel, you may cancel the purchase within 14 days of buying it or, if later, of receiving these details in writing. You can cancel by email to the address below or through Google Play. The full price is refunded within 14 days of your cancellation notice, with no cancellation fee. When contacting the developer about a purchase, please include the Google Play order number from your emailed receipt, since that is the only way a specific purchase can be identified.
• Long-time users. Any installation of the app from Google Play made before version 1.5.0 was published there keeps the complete app at no charge, permanently, whether or not it was ever opened, and is never placed on a trial. The grant is recorded on the device the first time version 1.5.0 or later runs there. From then on it travels with the backup described above when Android restores that device's data. It is not a purchased right. It covers every installation made before version 1.5.0 was published, and does not oblige the developer to extend it to installations made after that. If you installed the app before version 1.5.0 was published and the grant does not reach a device, whether a new or reset one or the same one after a reinstall, write to the developer at the address below and you will receive the full range at no charge. This can happen, for example, because Android backup was switched off or because the old device never ran version 1.5.0. No proof beyond your own statement is asked for.
• F-Droid. The version of the app distributed on F-Droid contains the full range and no purchase feature; all functionality is included at no charge in that version, permanently.

6. Age, and purchases by minors

By using the apps you confirm that you are of an age at which you can lawfully agree to these Terms in your country of residence, or that a parent or legal guardian has agreed on your behalf.

To buy the unlock you must be old enough to form a binding contract in your country of residence, or have the consent of a parent or legal guardian who accepts these Terms on your behalf. Parents and guardians are responsible for supervising purchases made through a Google account or device to which a minor has access, and are encouraged to use Google Play's family and purchase-approval controls.

7. Acceptable use

You agree not to use the apps in any unlawful way, and not to misrepresent modified or redistributed builds of the app as official releases of the developer.

8. Disclaimer of warranty

THE APP AND THE KEY APP ARE PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW. THE DEVELOPER DOES NOT WARRANT THAT THE APP WILL BE UNINTERRUPTED, ERROR-FREE, OR COMPATIBLE WITH EVERY DEVICE, ANDROID VERSION, OR AUDIO CONFIGURATION. This disclaimer does not affect your statutory rights as a consumer in relation to the purchase, including any statutory remedy for digital content that fails to conform.

9. Limitation of liability

TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE DEVELOPER SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR EXEMPLARY DAMAGES ARISING OUT OF OR RELATING TO YOUR USE OF, OR INABILITY TO USE, THE APP OR THE KEY APP. TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE DEVELOPER'S TOTAL AGGREGATE LIABILITY ARISING OUT OF OR RELATING TO THE APP, THE KEY APP, OR THESE TERMS SHALL NOT EXCEED THE AMOUNT YOU ACTUALLY PAID FOR THE UNLOCK, WHETHER IN THE APP OR AS THE KEY APP, OR, IF YOU PAID NOTHING, A SUM OF 50 USD. Nothing in this section excludes or limits any liability that cannot be excluded or limited under applicable law, and nothing in these Terms limits your statutory rights as a consumer.

10. No obligation to support; changes to the app and to these Terms

The developer has no obligation to provide ongoing technical support, maintenance, bug fixes, or future updates for the app or the Key App, whether or not you purchased the optional unlock. The developer may update, change, or discontinue the app or any feature at any time. A later update will not withdraw features already unlocked by a purchase from that purchase on that device. The only exceptions are changes required by law or outside the developer's control, such as changes to Android itself or to Google Play.

If these Terms change, the updated version will be posted at this address with a revised "Last updated" date. Material changes will be reflected here before or at the same time as they take effect. This section does not affect any statutory obligation the developer may have to supply updates necessary to keep purchased digital content in conformity.

11. Indemnification

You agree to indemnify the developer against third-party claims, and the reasonable costs of defending them, to the extent they arise from your violation of these Terms, of the law, or of a third party's rights.

12. Termination, and what it does and does not mean

These Terms apply for as long as you use the app. You may end them at any time by uninstalling it. The developer may end them if you materially breach them, for example by presenting a modified build as an official release.

Being honest about what termination can achieve: the app runs entirely on your device and has no network access, so the developer has no technical means of disabling it remotely and does not claim one. Termination means that your permission to use the app under these Terms ends and that you should uninstall it, not that anything happens to your device.

13. Google Play, F-Droid and other third parties

The apps are distributed through Google Play and F-Droid, and any purchase is made through Google Play. Those platforms have their own terms, which apply to you separately from these Terms and which the developer does not control. Where a platform's terms govern the purchase transaction itself, they take precedence over these Terms in respect of that transaction.

Who your purchase contract is with depends on where you are. Under Google Play's own terms, in some countries Google is the merchant of record for the sale, and in others the developer is, with Google acting as the developer's agent. This does not change your rights under these Terms or your statutory rights. In either case the developer remains your point of contact for support and refunds, and Google remains the processor of the payment itself.

Google and F-Droid are not parties to these Terms. They have no obligation to provide support, maintenance or any warranty for the apps under these Terms, and any support or refund responsibility described here is the developer's, not theirs. Nothing in this section limits any right you have directly against a platform under that platform's own terms.

14. Feedback

If you send the developer a suggestion, bug report or feature idea, the developer may use it to improve the app without restriction and without owing you payment, credit or confidentiality for it. This does not apply to any personal information you include, and it does not give the developer rights to anything else you own.

15. If the app changes hands

The developer may transfer the app, the Key App, and the rights and obligations under these Terms to another person or company, for example on a sale of the project. Your rights under these Terms, and any purchase you have already made, are not reduced by such a transfer, and you will be told through the app's store listing or this page.

16. Where you may use the apps

You may not use or obtain the apps in breach of applicable export control or sanctions laws. You confirm that you are not located in, or acting on behalf of anyone in, a country or on a list to which such laws would prohibit supply.

17. Severability

If any provision of these Terms is found to be unenforceable or invalid under any applicable law, the rest of these Terms remains enforceable and valid. The affected provision will be limited or eliminated to the minimum extent necessary, and the remaining provisions will continue in full force and effect.

This applies in particular to Section 2. Consumer-protection law in some countries does not permit a limitation of liability for personal injury caused by negligence. If that specific limitation is found unenforceable where you live, it is removed to that extent only. The rest of these Terms, including the rest of Section 2, remains in effect.

18. No waiver

If the developer does not enforce a right under these Terms on some occasion, that is not a waiver of the right and does not prevent it being enforced later.

19. What survives

Sections 2, 3, 4, 8, 9, 11, 13, 16, 17, 18, 20, 21 and 22 continue to apply after these Terms end, however they end.

20. Notices, and the language of these Terms

The developer communicates changes to these Terms by publishing them at this address, and responds to individual questions at the email address below. There is no account, no mailing list and no notification channel, because the app collects no contact details of any kind.

These Terms are written in English. Where a translation of them, or of the store listing, is provided for convenience and differs from the English, the English version prevails to the extent permitted by the law that applies to you.

21. Entire agreement

These Terms, together with the Privacy Policy, are the entire agreement between you and the developer about the app and the Key App. They supersede all earlier or simultaneous communications and proposals about them, oral or written, including marketing materials, community posts and direct correspondence. This section does not exclude liability for fraudulent misrepresentation. It does not affect any statement that applicable consumer law makes binding on the developer.

22. Governing law and jurisdiction

These Terms, and any dispute arising from or relating to them or to your use of the app, are governed by the laws of the State of Israel, without regard to its conflict-of-laws principles. Disputes are subject to the jurisdiction of the competent courts of Israel. For a consumer in Israel, that includes any court that has jurisdiction where the consumer lives.

Two exceptions apply. First, you keep the protection of the mandatory consumer-protection law of the country where you live, including any right it gives you to bring proceedings there. Second, any claim relating to Google's own handling of a purchase is governed by Google's own terms.

Before filing a claim, we ask that you first contact the developer at the email below and allow a reasonable opportunity to resolve the issue informally. This is a request, not a condition on your right to bring proceedings.

23. Contact

Questions about these Terms, refund requests, or any other inquiry: rotemzus@gmail.com.

The developer, who is also the seller of record wherever Google Play's terms make the developer rather than Google the merchant of record for your country (see Section 13), is:

Rotem Zussman
36 Karl Netter Street
Rishon LeZion
Israel

Granular Apps is the name under which Rotem Zussman publishes on Google Play. It is not a company.

Postal correspondence is accepted at that address. Email is the faster route and is the one used for support, refund requests and purchase questions.

The developer's identification number is provided to any consumer before a purchase, on request by email to the address above.

Accessibility of this page and of granularvolume.com is described in the accessibility statement.