KayingBricks Privacy Policy

Operator: Beijing Lingdian Badu Technology Co., Ltd. · Updated and effective: November 5, 2026

Applies to KayingBricks on Android (Google Play and app stores in mainland China), iOS, HarmonyOS, Windows, the WeChat Mini Program and the Xiaohongshu mini tool.

中文版本

1. Scope and platforms

This policy explains how KayingBricks handles information on each platform and how you can manage it. Our other products have their own privacy policies.

This policy does not cover app stores, operating systems, WeChat, Xiaohongshu or any app or website you choose to share with or open. Those services process information under their own privacy policies.

2. Data stored on your device

No registration, sign-in or phone number is required. To restore your work and preferences, the app stores the following in its private app directory (or local storage for the WeChat Mini Program and Xiaohongshu mini tool):

• build progress, current model, camera view and manual-build state;
• saved project snapshots, project titles and subtitles;
• settings such as build speed, language and playback preferences;
• the daily video-save count, used only for ad eligibility; saving is unrestricted when ads are unavailable;
• your agreement status and agreement version;
• temporary files created during export, recording or sharing.

This data supports building, restoring, exporting and sharing. The app does not actively upload it to our servers, and we do not operate accounts, cloud sync or online storage for it.

When you save an image or video, the file is written to your gallery (HarmonyOS shows a system gallery confirmation; Windows uses a file picker; the WeChat Mini Program uses the album API). When you share, the app or platform you choose receives the file and applies its own rules. Temporary files may be created and are cleaned up by the app or the operating system. Video recording captures only the app's visuals, not microphone audio; the app does not request microphone access. Saving writes to the gallery without reading your existing photos.

Device or system backups (for example, Android backup or iOS device backup) may include app-private data depending on your settings. WeChat, Xiaohongshu and similar platforms may keep local caches needed to run the app under their own rules. Those copies are managed by the relevant system or platform.

If you email us, we use your address, message and attachments to respond and handle your request, and retain them as long as needed for that purpose and as required by law.

3. Permissions and system capabilities

The app requests only what the corresponding feature needs:

The app does not request precise location, contacts, camera, microphone, phone state or read access to your photo library. The ad SDK in Android builds distributed in mainland China is configured in code to disable access to location and phone state (IMEI).

4. Ads and third-party services

Ads appear only in some Android channels to support the free app. Each channel uses different SDKs.

4.1 Google Play: AdMob and UMP

The Google Play build includes Google LLC's Google Mobile Ads SDK (AdMob) 25.5.0 and User Messaging Platform (UMP) 4.0.0, with no Chinese ad SDK. An app-open ad is shown once per cold start only after you have previously accepted the User Agreement; it is not shown on first launch, when returning from the background, or more than once per process. If the ad fails to load, is unavailable or the device is unsupported, the app opens normally and saving is unaffected. Saving videos does not require a rewarded ad and is not limited.

Google's SDK may collect or share IP address (which may indicate approximate location), Android advertising ID, app set ID, other identifiers associated with accounts signed in on the device where applicable, app and ad interactions (such as launches, taps and video views), and performance and diagnostic data. These are used to deliver and measure ads, analyze and improve the service, prevent fraud and maintain security. Google and advertising and measurement partners may process this information depending on your region, your privacy choices and Google's settings.

Before requesting ads, the app uses UMP to update consent status and shows a consent form where required. Rejecting personalized advertising does not necessarily prevent all advertising or data processing. You can review or change your choices in Customize → Ad privacy settings, or reset or delete your advertising ID and adjust ad privacy controls in Android settings. Options vary by device and region.

See Google's Privacy Policy, how Google uses data from partners, and Google Mobile Ads SDK data disclosure.

4.2 Mainland China Android builds: Gromore and ad networks

Android builds distributed in mainland China include Gromore (Pangle) 7.8.1.4, aggregating ad SDKs from Tencent GDT, Baidu, Kuaishou and Sigmob. The app offers one free video save per day; from the second save onward, you need to watch a rewarded video before recording and saving. Ad SDKs are initialized only when an ad is needed. If ads are not configured, fail to load, time out or are unsupported, the app allows the save to proceed and does not block the feature.

Ad SDKs may process device identifiers (such as OAID), device model and OS version, network information (such as IP address and network type), app information, and ad impression, click and playback data, for ad delivery, frequency capping, measurement, anti-fraud and security. The app does not request location or phone permissions and explicitly disables access to location and phone state (IMEI) in the SDK configuration. Ad information may be shared with the participating ad networks and their partners, subject to their privacy policies.

4.3 Platforms without ad SDKs

• iOS: no advertising SDK, no ATT request, no IDFA or IDFV collection by the app, and no cross-app tracking. Saving videos does not require watching an ad and is not limited.
• HarmonyOS: the ad channel is a disabled placeholder and the current build contains no ad SDK. Network permission is declared as a reserve; the current version makes no business network requests.
• Windows: no advertising SDK; core features work offline.
• WeChat Mini Program: no advertising or third-party analytics SDK. Export happens locally and saving uses the WeChat album API. WeChat processes information needed to run the Mini Program under its own rules.
• Xiaohongshu mini tool: a front-end Canvas app with no account, no network requests and no third-party SDK. Saving and posting use Xiaohongshu's APIs.

These platforms may still process device, account or usage information through their operating systems, app stores, WeChat or Xiaohongshu under their own privacy policies; we do not control that processing.

4.4 Third-party SDKs

Each provider's legal entity, actual data collection and privacy policy are governed by its official materials and may vary by SDK version. We do not receive your builds or saved projects from any ad SDK.

4.5 Third-party processing

Ad SDKs process information independently. We do not receive your advertising identifier or ad delivery details and cannot delete their records on their behalf. Third parties may process information in their own countries or regions; where cross-border processing applies, their privacy policies and applicable law govern. You may exercise your rights under each SDK's privacy policy or contact us for assistance.

5. Retention, deletion and security

You can delete saved projects individually in the app. Settings, agreement status and other app-private data generally remain on your device until you clear app data or uninstall the app. Content saved to your gallery, shared with other apps or posted to a platform is not deleted by uninstalling the app; delete it in the relevant place. Backups managed by your system or platform must be managed through the backup service.

You can contact service@kayingai.com to request access, correction or deletion. We may need to verify your request to protect information; information we are legally required to retain or that is processed independently by third parties is excepted. We will respond within a reasonable period.

We rely on app sandboxing, system permissions and private app directories to protect local data. Google states that data collected by its Mobile Ads SDK is encrypted in transit using TLS; the transport and security measures of Chinese ad SDKs are governed by their privacy policies. No system can guarantee absolute security, so please protect your device and backups.

6. Minors

KayingBricks is a general-purpose building tool, not a service directed to children. Minors should use it with the consent and guidance of a parent or guardian, who may contact us with privacy questions. We do not knowingly collect personal information from minors. If we learn that we have processed personal information of a child under 14 without guardian consent, we will delete it or stop processing as required by law. Age ratings are set by each app store and shown on its listing.

7. Changes to this policy

We may update this policy as features, third-party services or legal requirements change, and will update the "Updated" and "Effective" dates on this page. For material changes, we will notify you through an in-app notice, store release notes or a notice on this page as applicable. Continuing to use the app after an update means you accept the updated policy; if you do not agree, please stop using the app and uninstall it.

8. Contact us

We will respond to privacy questions, complaints and requests within a reasonable period.