Privacy Policy
Last updated: 31 October 2026
Introduction
Mewstro ("we", "our", "us") is run by Mikey Hurdle, a sole trader based in the United Kingdom, who is responsible for your personal information under UK data protection law. This Privacy Policy explains what we collect, who can see it, and how we keep it safe when you use the Mewstro apps for iPhone, Apple Watch and Android, the Mewstro web app, the teacher dashboard and mewstro.com.
Information We Collect
You need an account to use Mewstro. When you create one we collect your email address and a display name, through Sign in with Apple, Google Sign-In, or email and password via Supabase Auth. While you are signed in, the app saves what you log to our servers, so it is backed up, available on your other devices, and visible to your teacher if you join a studio. That includes: • Practice sessions: the date, how long you practised, your instrument, what you worked on, the piece and tempo, and anything you add in the reflection after a session, such as your notes, mood, focus rating, whether you met your goal and your goal for next time. • Intentions: when you set one, what you'll work on, any focus note you type, the time you planned, any time you add, and the time you actually played. • Mood check-ins and any note you add to them. • Your practice plan, your repertoire (pieces, composers, progress and tempo targets) and your regular lesson times. • Your goals: what you're working towards and by when, the plan of weekly checkpoints, the pieces you choose, how you say each part is going and any notes you add to them. • Breaks: from app version 1.0.11 you can mark a break, such as a holiday, illness or rest. We keep the dates, the reason you pick and any short note you add. The reason and the note stay in your own account and on your own devices. We never send them to your teacher, to a studio email or to anyone else. • From app version 1.0.11, when you change a piece's status, such as from Learning to Polishing, the date it changed. • Your settings, such as your weekly practice target, instruments and reminder times. • Notes you add when you complete an assignment from your teacher. • Milestone videos, but only when you choose to share one with your teacher or your studio. Videos you keep private stay on your phone. Practice audio recordings stay on your device. If you sign up through a teacher's invite link or code, we record that code and the link's campaign details so we know which studio or channel you came from. In the iPhone and Android apps we keep a simple record of how you use Mewstro, linked to your account: when you open the app, which onboarding steps you finish or skip, when you see the Premium screen and whether you buy, when you set an intention or share a card, and your notification and email choices. It never includes anything you type, such as notes, intentions or piece names. We use it to understand where Mewstro helps and where people get stuck, and to decide which help emails to send. We keep it for 13 months. The Apple Watch app sends none of it. Versions of the iPhone app before 1.0.10 also send anonymised, aggregated usage counts to TelemetryDeck, with no personally identifiable information, no IP address tracking and no cross-app identifiers; from 1.0.10 TelemetryDeck is removed and the apps use no third-party analytics. Apple's os_log is used for on-device debugging and never leaves your device. If you buy Premium on iPhone, Apple tells us which plan you bought and when it renews or ends, so we can show it on your account. We never see your card details. When your account starts its 30 days of every feature, we record when those 30 days start and end, so the app knows what's unlocked for you. We keep that record with your account. We do not sell, rent, or share any of this data with advertisers or data brokers, and Mewstro does not contain third-party advertising SDKs.
How We Use Your Information
We use your data to run Mewstro: tracking sessions, calculating streaks, showing your progress, powering widgets and reminders, and sending the emails you have switched on, such as your monthly recap. Emails. When you create an account we send a few emails to help you get started, such as a welcome and a summary of your first week, chosen by what you've done in the app. You can turn these off in the app's Settings, under Emails, or with the link in any email. We only send offers, such as Premium deals, if you switch them on in Settings and tell us you're 13 or over. Students in a teacher's studio never get offers from us, and we don't track whether they open our emails. Mikey, who runs Mewstro, gets a daily summary of new sign ups and first practices so he can help people get started. If you join a teacher's studio, we share your practice with that teacher, and some of it with your classmates. The next section explains exactly what. We never sell, rent, or share your personal data with third parties for marketing purposes.
Teachers and Studios
Joining a studio is your choice. You join by entering your teacher's invite code or following their invite link. From then on we share your practice with that teacher so they can follow your progress and plan your lessons. What your teacher sees on their dashboard: • Your display name and instruments. • Your practice sessions from the last 90 days: the date and time, how long you practised, your instrument, what you worked on, your mood, your focus rating, and the notes you write after a session, word for word. • Your streak, your weekly and monthly minutes, and a calendar of your practice. • Your repertoire. Your teacher can also add pieces to it and edit or remove them. • The assignments they set you, whether you have completed them, and the notes you add when you do. • Milestone videos you have chosen to share with your teacher. • Your goals: what you're working towards and by when, the plan of weekly checkpoints, the pieces you've chosen, how you've said each part is going, any notes you add to them, and how much time you've logged on each. Your teacher can also set or change your goals and add their own notes, which you'll see in the app. • Your weekly practice target. • Patterns we work out from what is listed above, such as the time of day you focus best, the weekdays you practise most, and how a week compares with your own usual. Your teacher sees parts of the day (morning, afternoon, evening) and weekday names in these patterns, and nothing we work out adds new information about you. • From app version 1.0.11, if you mark a break, whether you are on a break and its dates. That is all: your teacher does not see the reason or any note, and a break is shown as "on a break" rather than as time away. • From the Mewstro app update that tells you about it (version 1.0.10, on the day it is released): your intentions. That is what you say you'll work on, any focus note you type, and the time you planned against the time you played, linked to the session. Intentions you set before that update stay private and your teacher will never see them. Teachers can also get a weekly email listing the students on their studio leaderboard with each one's practice minutes, number of sessions and streak, and a short line about how each one's week felt, based on the mood and focus ratings they gave. Some studios also get a daily email naming new students and completed assignments. Your teacher sees your practice whether or not you appear on the leaderboard. Your teacher does not see your email address, the reason or note on a break (from 1.0.11), your goal for next time, intentions you set before the 1.0.10 update, your mood check-ins, your practice plan, your lesson times, or any video you have not shared with them. Teachers cannot message you through Mewstro, and there is no way for them to export your data. What classmates in the same studio see: • If you are on the studio leaderboard, your display name, your position and your practice minutes for the week. You are on the leaderboard when you join, and you can hide yourself from classmates at any time from the leaderboard screen. Your teacher still sees your practice when you are hidden. • Milestone videos you have chosen to share with your studio, with your display name and the piece. Classmates never see your sessions, notes, mood or focus ratings, your goals or your weekly target. Parents: Mewstro has no separate parent account or parent view. A parent who set up the account, or who uses the child's login, sees what the child sees. Leaving a studio: you can leave at any time with Leave Studio in the iPhone or Android app. When you leave, we take you off your teacher's roster and dashboard, the studio leaderboard and your teacher's weekly email, and we remove the assignments they set you and your notes on them. From then on your teacher and your classmates can no longer follow your practice. Your own practice history stays in your account, and you can keep using Mewstro on your own or join another studio. Weekly emails your teacher has already received stay in their inbox. If your app doesn't have Leave Studio yet, email support@mewstro.com from the address you signed up with and we will remove you from the studio for you.
Sharing Your Week
You can share a week of your practice with anyone you choose, for example a teacher who doesn't use Mewstro, from the Practice screen or Profile in the app. Before anything is shared you see a preview of exactly what will be on the page, and you choose what to include. Your name, instrument, practice days and minutes, and your intentions (what you planned and how long you played) are included unless you switch them off. Your focus text, your notes and your mood are left out unless you switch them on. Mewstro makes a copy of that week at the moment you share it and puts it on a page at mewstro.com/w/ followed by a long random code. Practice you log afterwards is never added to it. You send the link yourself, through your phone's share sheet. Mewstro never contacts the person you send it to, and we don't ask for their name or email address. Anyone who has the link can see the page, without an account, until it expires 30 days after you shared it or until you turn it off in Profile, whichever comes first. If you forward the link, the people you forward it to can see it too. The page is hidden from search engines, runs no analytics or cookies of its own, and counts how many times it has been opened (just a number, so you can see that in Profile). Once a link has expired or been turned off, the page shows that the week isn't available any more. The page also has a short section inviting music teachers to try Mewstro. If a teacher follows it and books a walkthrough or starts a trial, we note that they came from a shared week, using a separate code that doesn't reveal your page or who you are. Teachers on Mewstro can also copy a personal link from their dashboard to send to another teacher. We record which link brought a teacher to us, and nothing else about the person who sent it.
Embedded Video (YouTube)
Teachers can share video links with their studio, and these play inside the app using YouTube's privacy-enhanced embedded player (youtube-nocookie.com). In this mode, YouTube does not store personalised tracking cookies unless you actually play the video. When you play an embedded video, YouTube (Google) may collect information such as your IP address and device details under its own privacy policy — see policies.google.com/privacy. We never send your Mewstro account details, practice data, or identity to YouTube, and Mewstro receives no data back from Google about what you watch.
Our Website
On mewstro.com, the Mewstro web app and the teacher dashboard, some things are essential and always on: • Sign-in cookies that keep teachers and students logged in. • A note in your browser of your cookie choice, so we don't ask again on every page. Everything else waits until you accept cookies in the banner. Until then the site loads no analytics and sets no other cookies. If you accept, we use: • Vercel Web Analytics, which counts page views without cookies. • Tealium, which receives page views and the events you trigger on the site (such as starting a sign-up) and passes page views on to Google Analytics. Tealium can set cookies of its own (such as utag_main, and TAPID on Tealium's own domain), and Google Analytics sets its own (_ga and similar). • Microsoft Clarity, which records how our marketing pages are used, such as clicks and scrolling, so we can improve them. It can set cookies called _clck and _clsk. Clarity never runs on the teacher dashboard or the student web app, whatever you choose, because students' practice notes are shown there. • One cookie of our own, mewstro_first_touch, which remembers the campaign and page you arrived from for 90 days. On the teacher dashboard and the student web app, the page addresses we send to analytics leave out anything after the question mark, so they never carry a student's name. If you reject, none of these load. You can change your choice at any time from Cookie settings at the bottom of our pages, or by visiting mewstro.com/?cookies=1. If you withdraw consent, we delete the cookies set on mewstro.com. Cookies set on another company's domain, such as Tealium's TAPID, can only be cleared from your browser settings.
Data Storage & Security
Your account and practice data are stored with Supabase in London, UK. Access to your data is restricted by database rules, and the teacher dashboard checks that a teacher runs your studio before showing them anything. The apps also keep a copy of your data on your device. We do not store payment card details. Purchases in the apps are handled by Apple (App Store) or Google (Google Play), and teacher subscriptions are billed by Stripe.
Your Rights
You can export your practice data as CSV files from the iPhone app at any time. You can delete your account and all associated data by contacting us at support@mewstro.com or through the app's settings. Under UK data protection law (and the GDPR if you are in the EU) you have the right to access, correct, delete and take a copy of your data, and to object to how we use it. To use any of these rights, email support@mewstro.com. If you are unhappy with how we handle your data, you can complain to the Information Commissioner's Office at ico.org.uk.
Children's Privacy
Mewstro is rated 4+, and many of our students are children who join through their music teacher. Mewstro does not ask for a date of birth and has no separate parent account. Our Terms ask that anyone under 13 has a parent or guardian set up their account, and we do not knowingly collect personal information from children under 13 without parental consent. A child's practice is shared with their teacher and studio in the same way as everyone else's, as described above. If you are a parent or guardian and believe your child is using Mewstro without your consent, or you want to see or delete what we hold about them, please contact us at support@mewstro.com.
Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new policy on this page and updating the "Last updated" date.
Contact Us
If you have any questions about this Privacy Policy, please contact us at: Email: support@mewstro.com