Last updated: 27 July 2026
Voxstrum is a music learning application developed and operated by Voxstrum Ltd ("we", "us", "our"), United Kingdom. This policy explains how we collect, use and protect your personal data when you use our app.
Voxstrum is used by adults, teenagers and, through the Family plan, by children under 13 with guardian consent. Section 8 explains in detail how we handle children's data — please read it if you are a parent or guardian.
We collect the following information when you use Voxstrum:
We do not collect or store your location — not from anyone, and not on any plan.
Tester sign-ups. Separately from the app, if you volunteer for our Google Play closed test at voxstrum.app we collect the Google account email address you give us, and — only if you choose to fill them in — your first name and the phone or Android version you will be testing on. We use these solely to add you to the Play test group, to email you about the test, and to send your free-access key at launch. We do not add you to a marketing list and we do not share the list with anyone outside the Play testing process. The lawful basis is your consent, which you give with the tick-box on the form; you can withdraw it and have the entry deleted at any time by emailing privacy@voxstrum.app.
Under UK GDPR we rely on the following legal bases:
We do not sell your personal data, and we do not share it with anyone for advertising. We share data only with the following service providers, strictly to operate Voxstrum:
All of these providers are contractually required to protect your data and may not use it for their own purposes.
Audio you record in Voxstrum is stored in a private, encrypted cloud storage bucket, and it is never used to train AI models. Section 11 sets out exactly what deleting your account does and does not remove.
Your practice recordings are analysed on your own device. When you record a practice session, the pitch and timing analysis happens locally on your phone. Only the resulting numbers — such as a timing score and the notes you were aiming for — are sent onward for AI feedback. Your recording itself is kept in your private cloud storage, and your practice audio is never sent to an AI provider.
There are two exceptions you should know about, and both involve speech:
Voxstrum uses AI in a few places. We think you should know precisely what each one receives:
Every AI feature listed above sends its request from our own secure backend, never directly from the app, and our AI keys never touch your device. The one speech feature that does not route through our backend is your device's own built-in recogniser, described in section 6.
Voxstrum is used by children, primarily as student seats on the Family plan set up by a parent or teacher. We designed the app around that from the start, and we comply with the UK GDPR (including Article 8) and the US Children's Online Privacy Protection Act (COPPA).
Age declaration. Everyone declares an age band when they first create an account. This happens before any lessons or AI features are available.
Guardian consent for under-13s. If an account is declared as under 13, we require verifiable consent from a parent or guardian before that child can link to a teacher or use AI features. We ask for the guardian's email address, send them a consent request, and hold the account in a restricted state until they approve. This is enforced on our servers, not just in the app.
Additional protections for children and teenagers:
Guardian rights. A parent or guardian can review their child's progress, withdraw consent, and request deletion of their child's data at any time by contacting privacy@voxstrum.app. Withdrawing consent stops AI processing for that child.
We do not show adverts to anyone, and we never use children's data for marketing or profiling.
The Family plan lets a teacher or parent support up to five students. If you are a student linked to a teacher, that teacher can see:
Your teacher cannot see your Studio song projects unless you submit one to them for review. Your private compositions stay private.
Linking is always initiated by an invite code and can be undone. When a link is removed, messaging is revoked immediately.
To keep the platform safe — particularly for younger users — we screen certain content automatically:
Content that is blocked, or that a user reports, is recorded in a moderation queue for review. We keep an audit log of child-safety events. These records exist to protect users and may be retained after other data is deleted where we have a legal or safeguarding reason to keep them.
We retain your account data for as long as your account is active. You can delete your account at any time from Profile → Delete account in the app.
Doing so immediately removes your profile, your practice sessions, your AI feedback history, your notes, your practice recordings, and your sign-in.
Some content you have created is not yet removed automatically by that button: Studio compositions and their exports, Studio recordings and uploads, saved Play Along takes, your ratings and achievements, and your profile photo. If you want everything erased, email privacy@voxstrum.app and we will delete it within 30 days. We are actively working to make one tap remove everything, and we would rather tell you this plainly than imply otherwise.
See how to delete your account for step-by-step instructions, including how to request deletion if you can no longer sign in.
Safeguarding and moderation records (section 10) may be retained longer where we have a legal obligation or a child-protection reason to keep them.
Tester sign-ups (section 2) are kept for the duration of the closed test and for up to 12 months afterwards, so that we can honour the free-access key we promised and answer questions about it. Ask us at privacy@voxstrum.app and we will delete your entry sooner. Deleting a tester entry is separate from deleting a Voxstrum account — tell us if you want both.
Voxstrum is operated from the United Kingdom, and your files are stored in the United Kingdom and Europe. Some of our service providers — including our backend functions and our AI providers — process data in the United States. Where data leaves the UK or EEA, we rely on appropriate safeguards such as the UK International Data Transfer Agreement or Addendum, and standard contractual clauses.
Under UK GDPR and applicable law you have the right to:
To exercise these rights, contact us at privacy@voxstrum.app.
This section applies if you live in a US state with a comprehensive privacy law, such as California, Virginia, Colorado, Connecticut or Utah.
We do not sell your personal information, and we do not share it for cross-context behavioural advertising. We show no adverts of any kind, and we have never sold personal information — including that of anyone under 16.
We collect the following categories of personal information:
We collect these for the purposes described in section 3, and we disclose them only to the service providers listed in section 5, who are contractually barred from using them for their own purposes.
Depending on your state, you have the right to:
To exercise any of these, email privacy@voxstrum.app, or delete your account directly from Profile → Delete account in the app. We will never charge you or reduce your service for asking. If we decline a request, you may appeal by replying to our response.
If you are the parent or guardian of a child under 13 in the United States, section 8 explains your rights under COPPA, including how to review your child's data and withdraw consent.
Voxstrum does not use advertising cookies or cross-app tracking, and we show no adverts. We use Firebase Analytics solely for aggregate, anonymous usage statistics to improve the app.
We may update this policy from time to time. We will notify you of material changes via the app or by email. Continued use of Voxstrum after changes constitutes acceptance.
Questions about this policy?
privacy@voxstrum.app
Voxstrum Ltd, United Kingdom