Last updated: September 7, 2026
What applies to the app you can install today.
The version of Granular Volume currently on Google Play is free to use, with no trial period and no payment of any kind. Nothing in these Terms asks you to pay for it.
Section 5 below describes a free trial and an optional one-time unlock. That section takes effect with version 1.5.0, which has not been released yet. It is published here in advance so it can be read before it ever applies to anyone.
If you install the app before version 1.5.0 arrives, you keep the complete app, every step of it, free and permanently. The trial and the unlock will apply only to installations made after that version is published.
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"), and of the optional companion application Volume Control Full Range Key ("the Key App") 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 additionally asks you to actively accept these Terms on a consent screen before it first runs, and the purchase screen for the optional unlock states again, at the moment of purchase, that buying constitutes agreement. Either form of acceptance is sufficient; together they are the record that you agreed.
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. It is a convenience utility only.
The audible effect of the app depends on your device. Android devices differ in how they route and process audio; on some devices certain sound types (for example, call audio on a small number of phones, or system interface sounds on all phones) are handled in hardware or in audio paths that no application of this kind can reach. 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.
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, and at your request silence, sounds you may be relying on to alert you, including ringtones, notifications and, on most devices, alarms. 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.
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, and 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.
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.
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. Devices that were already using the app before this changed are not affected; see "Long-time users" below.
To buy the Key App 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.
You agree not to use the app in any unlawful way, and not to misrepresent modified or redistributed builds of the app as official releases of the developer.
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, and that you will use the apps lawfully.
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.
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 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.
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; features already unlocked by a purchase will not be withdrawn from that purchase on that device by a later update, except as required by law or by changes 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.
You agree to indemnify, defend, and hold harmless the developer from and against any and all claims, liabilities, damages, losses, costs, and expenses (including reasonable legal fees) arising out of or in any way connected with your use of the app, your violation of these Terms, or your violation of any third-party rights, except to the extent a claim results from the developer's own breach of these Terms or from liability that cannot be excluded under applicable law.
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.
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, and 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.
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.
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.
You may not use or obtain the apps in breach of applicable export control or sanctions laws, and 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.
If any provision of these Terms is found to be unenforceable or invalid under any applicable law, that unenforceability or invalidity will not render the rest of these Terms unenforceable or invalid. 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, where 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, and the rest of these Terms, including the rest of Section 2, remains in effect.
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.
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.
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.
These Terms, together with the Privacy Policy, constitute the entire agreement between you and the developer relating to your use of the app and the Key App, and supersede all prior or contemporaneous communications and proposals about them, whether oral or written, including anything stated in marketing materials, community posts, or direct correspondence. Statements in such materials that were accurate when made (for example, describing the app before the optional unlock existed) do not enlarge the developer's obligations under these Terms. This section does not exclude liability for fraudulent misrepresentation, and does not affect any statement that applicable consumer law makes binding on the developer.
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, and subject to the exclusive jurisdiction of the competent courts of Tel Aviv-Jaffa, Israel, except where the mandatory consumer-protection law of your country of residence grants you the right to bring proceedings, or to rely on local law, in your own jurisdiction, and except that any claim relating to Google's own handling of a purchase is governed by Google's own terms. Before filing a claim, you agree to first contact the developer at the email below and allow a reasonable opportunity to resolve the issue informally.
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
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.