Privacy

Last updated: 30 October 2026

StringKick is run by Rijna Media Producties ("we", "us"). This policy explains what data we handle when you use the StringKick website (stringkick.com) and the StringKick app for iOS and Android, and what your rights are.

What we collect

Account details

If you create an account: your email address and a password (stored encrypted — we can't read it). You can use most of StringKick without an account; progress is then stored only on your device.

If you buy or restore a subscription in the app without creating an account, we set up an account for you with no name or email address, only a random identifier, so your purchase and your progress are kept. You can add your email later in the app, or delete this account under Profile.

Purchases and subscriptions

You can buy a subscription on stringkick.com or in the StringKick app.

On stringkick.com: your name, your email address, and the details of the order (what you bought, what you paid, and the VAT charged). EU tax rules also require us to establish and keep evidence of which country you're in; we derive that from your IP address and the country of your payment method rather than asking for it at checkout. Your card details go directly to our payment providers and never reach our servers.

In the app: Apple (App Store) or Google (Google Play) sells you the subscription. They take the payment, establish where you are and handle the VAT, under their own privacy policies, and we never receive your payment details, name or address from them. We do receive the subscription itself (which plan, when it started and ends, whether it renews, and a transaction reference) through RevenueCat, the service we use to check store purchases, and we link it to your StringKick account so your Game Pass works on every device. You manage or cancel an app subscription in your Apple ID or Google Play settings.

Learning progress and gameplay

Levels completed, scores, stars, streaks, and how you answer quiz questions (for example which questions you get right and how long they take). When you're logged in, this is linked to your account so your progress syncs across devices and sessions. When you're not logged in, gameplay statistics are submitted anonymously — we use short-lived technical identifiers (such as your IP address) only for security and rate limiting, not to identify you.

Crash and error reports

If something breaks, a report goes to Sentry, our error-monitoring service, hosted in the EU. It holds the error message, your device and browser type, and what the app was doing just before, such as which screen was open and what was tapped. Sentry also stores the IP address the report came from. If something goes wrong while you sign up or log in, the report can include the email address you entered, so we can see what happened. We use these reports only to find and fix problems.

Messages you send us from the app

When you use Contact us in the app, your message goes to our support inbox and to Sentry, along with the email address you give us, your account details if you're logged in, and technical details about the app (version, device, and what it was doing just before). We use them to answer you and fix what went wrong.

Anonymous usage statistics

We use Plausible Analytics, a privacy-friendly, EU-based service, to count things like page views and completed quizzes. It uses no cookies and collects no personal data; statistics are aggregate only.

Microphone

Some games listen to your guitar to detect which note you're playing. Audio is analyzed in real time on your device only — it is never recorded, stored, or sent to us or anyone else. You can always decline or revoke microphone access in your device settings; games that don't need the microphone work without it.

How we use it

• To run the games and keep your progress in sync.
• To improve the games: we look at aggregate gameplay statistics (for example, how many players complete a level) to tune difficulty and fix confusing spots.
• To email you: service messages about your account, and occasional tips and product updates, which you can unsubscribe from at any time via the link in each email.

Who we share it with

Nobody, in the everyday sense: we don't sell data, we show no ads, and there is no cross-app or cross-site tracking. Like most websites and apps, we rely on a few service providers who process data on our behalf: our hosting provider, Sentry (error monitoring, EU), Plausible (analytics, EU), ActiveCampaign (email), Stripe and PayPal (payments on stringkick.com), and RevenueCat (checking in-app purchases). They may only use the data to provide their service to us.

How long we keep it

Your account and progress are kept as long as you have an account. Anonymous gameplay statistics are kept in aggregate form. Error reports are automatically deleted after 90 days. Records of subscriptions bought in the app are kept with your account and deleted with it.

What we have to keep

When you buy a subscription on stringkick.com, tax law requires us to keep the invoice details: your name, the country we charged VAT in, the amount you paid and the VAT itself. We keep these as part of our business records for as long as the law requires, and this applies even if you delete your account. We keep only what we're obliged to keep, we don't use it for anything else, and we delete it once the retention period ends. For subscriptions bought in the app, Apple or Google is the seller and keeps those records.

Deleting your account

You can delete your account at any time:

• In the app: Profile → Delete account. Your access ends immediately and your account and personal data are erased within 30 days.
• By email: send a request to [email protected] from the email address on your account, and we'll do the same within 30 days.
• If your account has no email address (one set up for you when you bought in the app): delete it in the app as above, or email us the order number from your App Store or Google Play receipt, and we'll find the account and do the same within 30 days.

If you subscribed in the app, also cancel the subscription in your Apple ID or Google Play settings: deleting your StringKick account doesn't stop Apple or Google from charging you.

The one exception is the invoice records described under What we have to keep, which tax law requires us to retain even after your account is gone.

Deleting only part of your data

You don't have to delete your whole account. If you'd like us to remove specific data — your practice history, for example — email [email protected] from the address on your account and we'll do it within 30 days, or explain why we can't (for instance where tax law requires us to keep invoice records).

Your rights

Under the GDPR you can ask us for access to, correction of, deletion of, or a copy of your personal data, and you can object to or restrict how we use it. Email [email protected] and we'll respond within a month. You also have the right to complain to the Dutch data protection authority (Autoriteit Persoonsgegevens).

Children

StringKick is intended for a general audience and shows no advertising. We don't knowingly collect personal data from children beyond what's described above; if you believe a child has created an account and you'd like it removed, contact us and we'll delete it.

Changes

If we change this policy we'll update this page and the date at the top. Meaningful changes (like a new category of data) will be announced in the app or by email.

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