Privacy Policy

What we collect

When you use our apps, we process the following categories of data:

• Account data — your e-mail address or the identifier shared by Apple or Google when you sign in, and the display name you choose. Guest accounts get an anonymous identifier instead.
• Gameplay data — your in-game progress and statistics: answers, scores, streaks, competitive standings, chosen topics, avatar selection, and achievements.
• Purchase data — subscription and purchase state confirmed by the app store you bought from (transaction identifiers and entitlements). Payments are processed entirely by Apple or Google; we never see your card details.
• Device and technical data — push notification token, time zone, app language, device model and OS version, an app-instance identifier used by our analytics, and device-integrity signals used to protect our games from abuse.
• Advertising data — in an app that shows ads: your device advertising identifier (the IDFA on iOS, the Advertising ID on Android), coarse device and app information, and which ads you were shown and interacted with. Our advertising partner uses these to select and measure ads. An app that shows no ads collects none of this, and neither does an app with a Premium subscription active.
• Approximate location — our analytics and sign-in providers derive an approximate region from your IP address. We do not use GPS, and our apps never request a location permission.
• Support data — anything you send us by e-mail.

What we do not collect

Our apps do not access your contacts, photos, files, or precise location. All in-game imagery is published by our editorial team — there are no user uploads. We do not sell your data for money and we hand nothing to data brokers. Personalized advertising is the one practice that some US state laws still count as a "sale" or a "share"; we describe it plainly under "US state privacy rights" below, and you can switch it off.

Why we collect it

We use this data to:

• run the games — sync your progress across launches, match you with other players, deliver the notifications you subscribed to;
• keep play fair — verify purchases server-side, detect cheating and abuse, protect our backend from bots;
• pay for the free version — where an app shows ads, our advertising partner selects and measures them, and counts the ones it was paid for;
• improve our products — aggregated analytics tell us which features work and where players struggle;
• answer your support requests.

Advertising

Not every Gronsfeld app carries ads, and one that does not makes no ad request and hands nothing to any ad network. Where an app does show ads, that is what pays for it being free to play, and the ads are served and measured by Google AdMob. To choose an ad and to count whether it worked, AdMob uses your device advertising identifier — the IDFA on iOS, the Advertising ID on Android — together with coarse device and app information. We never hand our advertising partner your e-mail address, your name, or your game data.

Two ways out are ours to give, and both are complete. A Premium subscription removes ads altogether: an app with Premium active makes no ad request at all. And in the EEA and the UK, where ads run on your consent, the app itself carries a "Privacy options" row in its Settings that reopens the consent form — withdraw there and it takes effect immediately.

Personalization on its own is governed by a setting on your device rather than by a screen our apps present: on iOS in Settings → Privacy & Security → Tracking, on Android in Settings → Privacy → Ads. Switching it off does not remove ads, but they are no longer chosen from your advertising identifier.

Legal bases (EEA/UK)

Where GDPR applies, we rely on: performance of a contract (running the app you asked for), legitimate interests (security, anti-abuse, aggregated analytics), legal obligations (purchase records), and your consent for personalized advertising.

In the EEA and the UK, an app that shows ads collects that consent on first launch, inside the app, through Google's User Messaging Platform. Until you agree, no ad is requested and the ad-related analytics signals stay switched off. You can withdraw consent at any time: the app's Settings screen has a "Privacy options" row that reopens the same form, and withdrawing takes effect immediately.

Who processes data for us

We use a small set of service providers, acting on our instructions:

• Google Firebase — authentication, database, cloud functions, analytics, push delivery, app integrity. Our game data is stored in Google Cloud data centres in the European Union. See Firebase privacy and security and the Google Privacy Policy.
• Google AdMob — our advertising partner: it selects, delivers and measures the ads in the apps that carry them. Google's User Messaging Platform, part of the same service, collects and stores your advertising consent. See how Google uses information from apps that use its services and the Google Privacy Policy.
• Google Play — purchases and subscriptions on Android. See the Google Privacy Policy.
• Apple — sign-in with Apple, purchases and subscriptions, push notification delivery on iOS. See the Apple Privacy Policy.

International transfers

Our primary storage is in the EU. Some providers (Google, Apple) may process limited data outside your country; they do so under recognised safeguards such as the EU Standard Contractual Clauses.

How long we keep data

Account and gameplay data are kept while your account exists. When you delete your account in an app, its profile and gameplay data are removed; purchase and audit records may be retained where the law requires it. Expired notifications and finished game sessions are cleaned up automatically.

Your rights and choices

You can, at any time:

• delete your account and its data directly in the app (Settings → Delete Account), or request deletion at gronsfeld.com/delete-account if you no longer have the app installed;
• disable push notifications in your device settings or in the app;
• ask us for a copy of your data, or ask questions, at contact@gronsfeld.com;
• complain to your local data-protection authority if you believe we handle your data unlawfully.

US state privacy rights

If you live in California, Colorado, Connecticut, Texas, Virginia, or another US state with a privacy law, you also have the right to know what we hold about you, to get a copy of it, to correct it, to have it deleted, and to opt out of targeted advertising and of the "sale" or "sharing" of your personal information.

We take no money for your data. But personalized advertising works by making your advertising identifier available to our advertising partner, and those laws count that as a "sale" or a "share". So we say it plainly rather than hide behind the wording: while you play a free, ad-supported app with personalization switched on, that is what is happening.

Do Not Sell or Share My Personal Information

This is the opt-out. Every route below is free; the in-app and device ones take effect immediately, and an e-mailed request is applied as soon as we can confirm it is yours:

• In the app — where an app shows ads, a Premium subscription stops them entirely, and in the EEA and the UK the "Privacy options" row in the app's Settings withdraws your advertising consent on the spot.
• On your device — to keep the app free and switch off only the personalization, use the setting your operating system provides: on iOS, Settings → Privacy & Security → Tracking, then turn the app off; on Android, Settings → Privacy → Ads, then opt out of ads personalization. Our advertising partner stops receiving your advertising identifier and can no longer personalize.
• By e-mail — write to contact@gronsfeld.com with "Do Not Sell or Share" in the subject line and we will apply it to your account. An authorised agent may send that request on your behalf.
• For the other rights — access, correction, deletion — use the in-app controls described above or write to us. We charge nothing for any of this, and we will not degrade your experience because you asked.

Children

Our apps are not directed at children under 13 (or the higher minimum age your country sets for consenting to data processing). Do not use them if you are under that age.

This website

gronsfeld.com is a static site: it shows no ads, sets no advertising cookies, and runs no third-party trackers. Everything described above about advertising happens inside the apps that show ads, not here.

Changes to this policy

If we change what we collect or how we use it, we will update this page and the date above before the change takes effect. Material changes will also be announced in the apps.

Contact

Gronsfeld Studio — contact@gronsfeld.com.