Privacy Policy — Crush Your SAT Prep

Last updated: 27 September 2026

Crush Your SAT Prep (“the app”, “we”, “us”) is an SAT practice app for Android, published by TEZZVO, which is responsible for the data described here. Questions or requests: privacy@tezzvo.com.

The short version

• No account. You never sign up, sign in or give us your name or email.
• Your practice stays on your phone. Your answers, scores, missed-question list, reports and settings are stored in the app’s private storage on your device, not on our servers.
• Anonymous usage data, which you can turn off. The app sends us anonymous usage events (for example, “a question was answered, correctly or not”) so we can find questions that are wrong or too hard. It is tied to a random ID the app makes up — never your name, email, phone number or advertising ID. Turn it off in Settings → Share anonymous usage data.
• No ads. No location permission. No contacts, photos, microphone or files.
• One purchase, handled by Google Play. If you unlock all questions, Google Play takes the payment; we never see your card details.
• We do not sell your data.

1. What stays on your device

Everything you do while practising is saved only in the app’s private storage on your phone: your answers and results, the questions you missed, how many times you have seen each question, problem reports you file, your reminder time and your appearance and privacy settings.

We cannot see any of it. It is deleted when you clear the app’s data or uninstall the app. One thing outside our control: if Android’s own backup is turned on for your Google account, Android may include this app’s data in your device backup, which Google stores for you — we do not receive it.

2. Anonymous usage data (PostHog) — optional

What is sent. When usage data is on, the app sends events to PostHog, our analytics provider:

• What happened in the app: the app was opened or went to the background; a practice session started or finished; a question was answered (which question, its subject, domain, skill and difficulty, whether you got it right, how long it took, and whether this was your first try); an explanation or concept card was opened, or rated helpful or not; a problem was reported on a question (the question and the reason you picked from a list — there is no text box); the store screen was opened or a purchase was started, finished or restored; which screen you are on; and how long the app took to start.
• A random install ID that the app generates itself, so events from the same phone can be counted together. It is not linked to your name, email, phone number, Google account or advertising ID.
• App and device details added automatically by PostHog’s software: app version, operating-system version, device manufacturer and model, screen size, language and time zone.
• Your IP address, which every internet request carries. PostHog uses it to estimate your country and city; the app itself never asks for or reads your location.

What is never sent. Your name, email, phone number or advertising ID; any text you type (grid-in answers stay on the phone — only “right” or “wrong” is sent); and your answers themselves.

Why. To find questions whose answer key may be wrong, questions labelled at the wrong difficulty, and explanations that do not help — and to see whether the app starts quickly and works.

Your choice. It is on when you first install the app. Turn it off at any time in Settings → Share anonymous usage data: from that moment no new event is collected, and events still waiting on the phone to be sent are discarded. A request already in flight at the moment you switch it off may still arrive.

Where and how long. PostHog stores the data in the United States (us.i.posthog.com) and keeps events for 30 days. The transfer is covered by PostHog’s data-processing agreement, which includes the EU Standard Contractual Clauses and PostHog’s EU-US Data Privacy Framework certification. PostHog’s privacy policy: https://posthog.com/privacy.

3. Purchases (Google Play and RevenueCat)

The app sells one thing: a one-time purchase that unlocks all questions.

• Google Play is the seller. It handles the payment and your payment details under Google’s own terms and privacy policy (https://policies.google.com/privacy). We never receive your card details, name or email from Google Play.
• RevenueCat is the service the app uses to check with Google Play whether the purchase has been made on your Google account, so the questions stay unlocked and can be restored on a new phone. When the app starts, RevenueCat gives the install its own random ID and records which products it has bought (purchase history: product, date, price and currency, and Google Play’s receipt for it), along with the app version and basic device details. RevenueCat’s privacy policy: https://www.revenuecat.com/privacy/.

Purchases are governed by Google Play’s terms.

4. App updates (Expo)

The app checks for small updates when it opens, from Expo’s update service (u.expo.dev). That request carries the app’s version, the update channel and a random ID the update software creates for this install, plus your IP address. It is used to deliver the right update and to count how many phones have it. Expo’s privacy policy: https://expo.dev/privacy.

5. The daily reminder

The reminder is off until you turn it on in Settings. When you do, Android asks for permission to show notifications. The reminder is scheduled on the phone at the time you choose; it is not sent from a server, and no notification token or other data leaves the device for it. Turning it off cancels it.

6. What the app does not do

• No account, sign-in, name, email or phone number.
• No advertising, and the advertising ID is not used for anything.
• No location permission; the app never reads GPS or network location.
• No access to contacts, photos, camera, microphone, calendar or files.
• No crash-reporting service.
• No data sold, and none shared for advertising.

7. Who receives data

Only the service providers named above, each processing data on our behalf: PostHog (usage data, if on), RevenueCat (purchase status) and Expo (app updates); plus Google Play as the store and seller. We may also disclose data if the law requires it.

8. Age

The app is intended for students 13 and older. It is not directed to children under 13, and we do not knowingly collect data from them. If you believe a child under 13 has used the app and you want their data removed, write to privacy@tezzvo.com.

9. Your choices and rights

• Stop usage data: Settings → Share anonymous usage data → off.
• Delete what is on your phone: Android Settings → Apps → Crush Your SAT Prep → Storage → Clear data, or uninstall the app.
• Usage data already sent is deleted automatically after 30 days. Because it is tied only to a random install ID, we usually cannot tell which events are yours; if you want us to look, write to privacy@tezzvo.com and we will do what we can within one month.
• Purchases: Google Play keeps the record of your purchase with your Google account; RevenueCat keeps the matching record so the purchase can be restored. To have RevenueCat’s record deleted, write to privacy@tezzvo.com.

Depending on where you live (for example under the GDPR, UK GDPR, CCPA/CPRA or LGPD), you have rights to access, correct, delete or object to the processing of your data, and to complain to your data-protection authority. Write to privacy@tezzvo.com to use any of them.

10. Security

Everything the app sends — to PostHog, RevenueCat, Google Play and Expo — travels encrypted over HTTPS. Data on the phone is kept in the app’s private storage, which other apps cannot read.

11. Changes

If this policy changes, we will update this page and the date at the top.

12. Contact

TEZZVO — privacy@tezzvo.com