Privacy Policy

Last updated: 13 September 2026. This policy applies to the Lotto Hanoi mobile application (published as ตรวจหวยฮานอย) and to this website.

1. Information we store

When you install the app it generates a random identifier and registers for push notifications. If you allow notifications, we store the following in our database:

• A push notification token issued for your installation by the push services of your platform (Expo, and Google or Apple behind it).
• A random identifier created by the app on first launch. It is not derived from your device's hardware identifiers, your name, or your email address, and it is not linked to any account or profile.
• A timestamp of when the record was created or last updated.

That is the complete list. The record exists for one purpose: addressing a notification to your device when a new draw result is published.

2. Information that stays on your device

• My Lotto numbers — the numbers you save, together with their draw dates.
• App settings — your theme and language preferences.

These are stored in the app's local storage on your phone. They are not transmitted to us and are removed when you delete the app.

3. Information we do not collect

We do not collect, and the app does not request, any of the following: your name, email address, phone number, postal address, contacts, photos, files, precise location, health data, or financial information. There is no sign-in, no user profile, and no behavioural tracking of how you use the app. We do not sell your personal information, and we do not share the records described above except with the service providers listed in section 6.

4. How we use the information

• To deliver a notification when a draw result for the categories you follow is available.
• To keep the notification list accurate — for example, to avoid sending the same alert twice.
• To respond to you if you contact us and ask us to look up or delete your record.

We do not use the information for advertising, profiling, or automated decision-making.

5. Advertising

The app displays advertising supplied by Google AdMob. To serve and measure those ads, Google and its partners may collect your device's advertising identifier, your IP address, and information about your device and your interactions with the ads.

• On Android, the app declares the AD_ID permission so that ads can use your advertising ID.
• On iOS, the app asks for permission through App Tracking Transparency before your advertising identifier is used to track you across other apps and websites. If you decline, ads are not personalised using that identifier.

You can read how Google handles this data in Google's Privacy Policy, and control personalised advertising through Google Ads Settings or your device settings (iOS: Privacy & Security → Tracking; Android: Security & privacy → Ads).

6. Service providers

The app relies on these providers, which process data as described:

• Convex — hosts our database, our backend, and this website.
• Expo — delivers push notifications to your device.
• Google — serves the ads shown in the app and delivers notifications on Android.
• Apple — delivers notifications on iOS.

Some of these providers process data on servers outside your country. Where that is the case, the transfer is governed by the provider's own data protection terms.

7. Retention and deletion

We keep your notification record for as long as notifications are useful to you. If you turn notifications off or uninstall the app, the app stops sending data, and the record simply remains until you ask us to delete it.

To have your record deleted, email support@appsetup.dev and include the push notification token shown in the app's Settings screen. We will delete the record within 30 days and confirm by reply. Deleting the app from your phone also removes the numbers and settings stored locally.

8. Security

Data is transmitted over encrypted connections (HTTPS) and stored on Convex's managed infrastructure. Only the developer of this app can access the database. No method of transmission or storage is completely secure, but we keep the amount of data we hold to the minimum needed to deliver notifications.

9. Children

The app displays lottery results and is not intended for children. We do not knowingly collect information from children under 13 (or the minimum age at which lottery-related content is permitted in your country). If you believe a child has used the app and you want the associated record removed, contact us and we will delete it.

10. Your choices and rights

• Turn result notifications off at any time in the app's Settings, or in your device settings.
• Email us to access or delete the record we hold about your installation.
• Depending on where you live, you may have additional rights over your personal data (for example under the GDPR). We will honour any such request through the same contact address.

11. Changes to this policy

If our data practices change — for example, if a future version of the app collects something new — we will update this page and change the date at the top. Material changes will also be noted in the app's release notes.

12. Contact

Questions about this policy or about your data? Email support@appsetup.dev.