Privacy Policy

The short version

Anatomy 3D is an offline anatomy atlas. It has no account, asks only for two optional runtime permissions (notifications, and the camera if you choose AR), and never reads your files, photos, contacts or location. The 3D models and all terminology are bundled inside the app, so studying works with the network switched off. The network is used for exactly four things: anonymous usage statistics, verifying a purchase with Google Play, checking a licence key that you type in yourself, and the optional rewarded ads described under “Advertising” below. If you buy an unlock, you never see an ad.

What we do not collect

• No name, email address, phone number or any other contact detail — there is no sign-up.
• No files, photos or microphone access, and no camera unless you choose AR mode (see “AR mode and the camera”). The app never opens a file picker.
• No location, neither precise nor approximate.
• No contacts, no calendar, no call or message data.
• No health data. Nothing you tap, search or answer in a quiz describes you or a patient, and none of it is linked to an identity.

What is collected

The app includes Google Firebase Analytics, which records anonymous usage events so we can see which parts of the atlas are actually used and where people get stuck. Typical events are: opening a body system, selecting a structure, running a search, starting or finishing a quiz, switching the interface language, and opening or completing a purchase. Each event may carry the identifier of the structure or system involved (for example skeletal or femur_r), a quiz score, and the search term you typed inside the app. If you open the optional student discount, the event also carries your answers to its three questions: what you study, which year you are in, and what you mostly use the app for.

Alongside these, Firebase records standard technical information: device model, operating system version, country (derived from the IP address, which Google does not store for this purpose), app version, and randomly generated identifiers — a Firebase installation ID and the Android Advertising ID. We never receive your IP address, and we cannot connect any of this to you personally.

There is no crash-reporting SDK and no third-party tracker in the app, and we do not sell your data. The only advertising component is Google AdMob, described in the next section.

Advertising (Google AdMob)

Since version 1.1.2 (29 October 2026) the app shows no ads at all and never starts the AdMob SDK. The paragraphs below describe the optional rewarded ads in versions 1.0.17 to 1.1.1, for anyone who has not updated.

The app contains the Google AdMob SDK and offers optional rewarded ads. Locked systems sit behind a paywall; instead of paying you may choose to watch one short ad, which lets you explore every system for one minute. After that minute the paywall returns, and you can watch another ad or buy an unlock. Ads are never shown unless you tap to watch one, and if you have any plan, the lifetime unlock or an active licence key you see no ads at all.

When you load or watch an ad, the AdMob SDK reads and shares with Google: the Android Advertising ID, your IP address (from which Google derives an approximate location), and app interactions and diagnostics (for example whether an ad loaded, was shown or was completed, and crash and performance data from the ads code). Google uses this for advertising, analytics and fraud prevention. We do not receive this data and we do not link it to you.

Consent. Where the law requires it, notably in the European Economic Area and the United Kingdom, the app first shows Google’s consent form (the User Messaging Platform) and loads ads only according to the choices you make there. You can change your choice later from the privacy options the app offers when consent is required in your region.

Your controls. You can reset or delete your Advertising ID, and opt out of ad personalization, in Android Settings → Privacy → Ads (the path varies slightly by device). Google explains how it uses data from apps that use its ad services at policies.google.com/technologies/ads. Ads need a network connection; the atlas itself still works offline for anyone who has bought an unlock.

Why we collect it

Analytics data is used only to improve the app: to find features nobody can discover, terms that are searched but missing from the atlas, quizzes that are too hard, and screens where people give up. We never use it to build a profile of a person. Data handled by the ads SDK is used by Google for the advertising purposes described above.

Purchases

Most systems and quizzes in the app need an in-app purchase: a weekly plan (the first week at a lower price), a monthly plan (first month half price), a yearly plan, or a one-time lifetime purchase. The lifetime purchase is sometimes offered at a lower price: a launch “Founders” price (shown as the Black Friday price for everyone until 30 November 2026), a one-time offer at half that price that appears once, for 30 minutes, after you close the purchase screen, and a student price for anyone who answers the three short questions about their studies. Each offer shows its price, and a time-limited one the time left, before you pay. The 3D cinematic scenes can be watched free for two minutes in total before a purchase is needed. Payment is processed by Google Play Billing; we never see or store your card details. The app stores only a yes/no flag on your own device recording whether the unlock is active, and asks Google Play to confirm that flag when you press "Restore purchase", and for a plan it also reads the renewal date so access ends when the plan does. Plans are managed and cancelled in Google Play under Subscriptions; the lifetime purchase never renews and has nothing to cancel.

Licence keys from our website

If you bought access on nasrtech.dev, you can type its licence key into the app to unlock it. The app sends only that key: a Gumroad key goes to Gumroad’s licence check (api.gumroad.com), and a key that starts with NT-AT- goes to our own check at www.nasrtech.dev/api/pay/verify. The answer says whether the key is valid, refunded or ended. The app keeps the key and that answer on your device and checks the key again when it starts; no name, email or device identifier is sent with it. To remove the key, uninstall the app or clear its data.

Purchases and follow-up email

When you buy on Gumroad (on our website or from the Windows app), Gumroad shares your email address, name, country and order with us; when you pay in USDT or Egyptian pounds on nasrtech.dev, you give us your email address and name with the order. We use them to deliver and check your licence and, usually a day or a few days later, to send you one email asking how it went. We email offers only if you agreed to receive them, and every such email has an unsubscribe link. Details are in our main privacy policy.

Anatomy 3D for Windows

The Windows app (Microsoft Store) has the same atlas, quizzes and cinematic scenes, and works offline. It differs from the Android app in a few ways:

• No Google Play, no ads, no notifications. The Windows app contains no advertising SDK.
• Purchases are made on Gumroad’s secure checkout (monthly or yearly plan), opened in your browser; Gumroad processes the payment under its own privacy policy and emails you a licence key. We never see your card details.
• Licence key check: when you paste the key under “Have a code?”, and again when the app starts, it sends only that key to Gumroad’s licence check (api.gumroad.com) to confirm the plan is active. No name, email or device identifier is sent.
• Usage statistics: the app sends anonymous events to Google Analytics (for example: a system opened, a part selected, a quiz started, the purchase screen shown) with the app version, the interface language and a random number created on your PC the first time the app runs. It does not send your name, email, files, location or any hardware or advertising identifier. Google Analytics may derive an approximate country from the connection.
• Local data: your settings, progress and licence key are stored only on your PC; uninstalling the app removes them.

AR mode and the camera

From version 1.2.0 the app can stand the 3D body in your room. Only then, and only if you allow it, it uses the camera, to show your room behind the model and to find the floor. The camera picture stays on your phone: we never see it, and the app does not save or send it. VR mode does not use the camera. You can refuse or withdraw the permission at any time in Android settings; the rest of the app works without it.

AR mode runs on Google Play Services for AR (ARCore), which is provided by Google and governed by the Google Privacy Policy.

Notifications

When a time-limited offer is shown, the app may ask once (Android 13 and later) for permission to show notifications, so it can remind you a few minutes before the offer ends. It is optional: if you refuse, the app works exactly the same. The reminder is scheduled on your device; no message is sent to us or through a push service.

Permissions

• INTERNET and ACCESS_NETWORK_STATE — used for the four purposes above (anonymous analytics, the Google Play purchase check, the licence-key check, and loading the optional rewarded ads). The atlas itself never downloads anything.
• com.google.android.gms.permission.AD_ID — lets the app read the Android Advertising ID. The Google AdMob SDK uses it to serve and measure the optional rewarded ads, and Google’s analytics library may also use it. If you reset or delete the ID in Android settings, the app keeps working.
• POST_NOTIFICATIONS (Android 13 and later) — optional, asked once when a time-limited offer is shown, only for the reminder described under “Notifications”.
• Google’s libraries also declare standard background permissions (such as WAKE_LOCK, FOREGROUND_SERVICE and the install-referrer service) to deliver analytics; they give no access to your files or personal data.
• No storage, microphone, location or contacts permission is requested at any point. The camera is requested only when you open AR mode.

Children

The app is an educational anatomy atlas intended for students and professionals. It is not directed at children under 13, and we do not knowingly collect information from them.

Data retention and your rights

Apart from a licence key you type in (see “Licence keys from our website”), the app sends us no personal data. If you bought on Gumroad or on nasrtech.dev, we keep what we received with that purchase and its follow-up email (see “Purchases and follow-up email”), and you can ask us to export or delete it. Anonymous analytics events are retained by Google for up to 14 months and then deleted automatically.

To stop analytics and ads entirely, uninstall the app; uninstalling also removes everything it kept on your device. You can also reset or delete your Advertising ID at any time in Android Settings → Privacy → Ads. For any request about this policy, write to support@nasrtech.dev and we will answer within 30 days.

Medical disclaimer

Anatomy 3D is a study and teaching tool. It is not a medical device, it does not diagnose or treat, and it is not a substitute for professional clinical advice. The Arabic terminology follows Unified Medical Dictionary conventions and is under continuing review.

Third-party content

The 3D models and descriptions derive from the open-source Z-Anatomy project (built on BodyParts3D), licensed CC BY-SA 4.0; the adapted models in this app are available under the same licence. Google's own handling of data from apps that use its services is described at policies.google.com/technologies/partner-sites and policies.google.com/technologies/ads.

Changes to this policy

We may update this policy; changes are posted on this page with a new "Last updated" date.

Contact

Questions about this policy: support@nasrtech.dev
NasrTech — Cairo, Egypt.

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