Privacy policy

1. Scope

Effective date: October 26, 2026

Developer Type: Independent Developer

Developer: The independent developer of Cifravo Math Trainer.

Developer location (general area only, not a full postal address): 创业A区，中国河北省沧州市任丘市 (Chuangye Area A, Renqiu, Cangzhou, Hebei, China).

Privacy contact: computeviewshub@outlook.com

This policy explains how the Android Cifravo Math Trainer app handles information. No account or registration is required. Core mathematics practice does not require you to agree to personalized advertising or watch an advertisement.

Cifravo is intended for high-school students, university students and adult learners aged 16 and over. It is not designed, advertised or promoted to users aged 15 or younger, including children under 13. School grades begin at different ages in different countries; the intended minimum age is 16 rather than the first year of high school in every country. Users aged 16 or 17 are not assumed to be adults.

2. Information stored on your device

The app stores practice settings, language and display preferences, practice result history (including question type, difficulty, correctness, time spent, timestamps and session references), aggregate scores and statistics, mistake and favorite questions, and game progress on your device. Ability reports are calculated locally from these records. The current app does not send these records to a developer-operated server or pass them to the advertising SDK as advertising request content. It has no app account, cloud synchronization or remote training database. Local storage may include recovery copies of saved records. Device backup and restore services may copy or restore app data according to your operating system and backup settings; the app does not implement its own cloud backup service.

3. Google advertising and consent services

The app includes Google Mobile Ads (AdMob) and Google's User Messaging Platform (UMP). Optional rewarded advertisements support advanced analysis, larger/custom worksheet exports and additional game hints. Rewards require the advertising SDK's earned-reward callback. Declining or being unable to load an advertisement does not prevent core mathematics practice.

Development builds and release builds explicitly configured for closed testing use Google's official test advertising IDs. Test advertisements still involve communication with Google services and should not be understood as an assurance that no information leaves your device.

Google's advertising SDK may process an IP address (including its use to estimate approximate location), advertising and other device identifiers such as the Android advertising ID and app set ID, advertising interactions such as views and taps, and diagnostic/performance information. Google describes these uses as advertising, analytics and fraud prevention. Availability of particular identifiers and processing depends on device settings, SDK behavior, applicable privacy choices and regional rules. We do not request precise device location for mathematics practice. We do not integrate a separate analytics, crash reporting or remote configuration service; diagnostic processing by the advertising SDK is separate from this statement.

On app launch, UMP requests updated privacy/consent information and presents a Google consent form when required and available. The app requests advertisements only when its consent flow succeeds and UMP reports that ads can be requested. This permission is not a claim that you agreed to personalized advertising. When UMP requires a privacy options entry, you can reopen Google's privacy options form from Settings → Help/compliance → Ad privacy choices. You can change the choices offered there. Regional availability and the applicable message determine the choices displayed. Core practice remains available if a consent form or advertisement fails. Google may process consent choices and associated technical information to provide this service.

You may reset or delete the advertising ID using the relevant Android privacy/advertising settings. Google manages SDK data under its own policies; deleting local practice records does not delete information already processed by Google. Google's SDK documentation states that its collected user data is encrypted in transit using TLS. We do not promise a specific retention period or remote deletion mechanism for Google's records.

See Google Privacy Policy, How Google uses information from sites or apps that use its services, and Google advertising controls.

4. Exports, clipboard and external applications

PDF worksheets are generated locally. When you choose to save, print or share a worksheet, the file is provided to the selected application, printing service or storage provider. Worksheets can include content selected from mistakes or favorites. Copying places generated practice content on the system clipboard. These destinations and other applications permitted by your operating system may handle the content under their own policies. An external application may upload files if you direct it to do so. The app does not automatically attach practice records when opening a browser or email application.

The analysis screen also offers a copy action that places structured practice analysis on the clipboard, including aggregate results, timing, module and difficulty summaries, recent-date summaries and the selected analysis scope. The app suggests that you may paste this information into an AI service of your choice; it does not automatically send it to an AI service. If you paste or submit it elsewhere, that service processes the information under its own policies.

5. Website and support correspondence

Opening our website uses an external browser. Website hosting and security services, including Cloudflare, may process request details such as IP addresses and browser information to deliver and protect pages. The website also uses Cloudflare's RUM/Web Analytics beacon to measure website performance. In the browser session checked, it sent the page URL, referring URL, a page-load identifier, browser/operating-system details, memory measurements and page-load timing information to Cloudflare. This website processing is separate from local mathematics records.

Cloudflare states that its RUM beacon does not use browser storage such as cookies or local storage, and that its RUM service receives but discards the source IP at its nearest data center rather than storing it in its core databases or logs. This description concerns RUM; it is not a promise that the website's security services or all other infrastructure never process identifiers or cookies. See Cloudflare RUM documentation and Cloudflare Privacy Policy.

If you email support, the developer receives your email address, message and any attachments to handle your request. Do not send unnecessary sensitive information or practice records. Support messages are received in an Outlook mailbox and processed by Microsoft to provide the email service; see the Microsoft Privacy Statement. Support correspondence is accessed by the independent developer of Cifravo Math Trainer and by Microsoft as necessary to operate the Outlook email service. The developer uses it to respond to requests and resolve reported issues, not for advertising or mailing lists. The developer reviews resolved correspondence monthly and deletes it from the active mailbox no later than 90 days after the request is resolved, unless continued retention is needed for an ongoing dispute, security investigation or legal obligation. Exception records are reviewed and deleted when that need ends. You may request deletion of messages and attachments you sent by contacting computeviewshub@outlook.com. The developer will assess and act on the request subject to applicable legal obligations, requesting only information reasonably necessary to verify it. Deletion from the active mailbox does not promise immediate deletion from Microsoft recovery systems or backups; those are governed by Microsoft’s service policies. The developer does not use additional support contractors under this policy.

6. Retention, deletion and your control

The current app keeps up to 2,000 recent individual result records in its main history; older results can be trimmed while aggregate totals remain. Local recovery copies may retain earlier saved records. Other local records remain until removed by app actions or the operating system. To remove all app-private records and local recovery copies, use Android Settings → Apps → Cifravo → Storage → Clear storage (wording varies by device). This also resets preferences and local progress. Uninstalling normally removes private app data, but operating system backups may retain or restore copies. Manage those separately through the backup provider. We cannot remotely retrieve or delete records held only on your device.

Clearing app storage does not delete exported PDFs, shared copies, clipboard history, emails or third-party SDK records. Delete exported files and copies with their destination providers, and use the system clipboard controls where available. Privacy choices may need to be collected again after clearing storage.

Depending on applicable law, you may have rights of access, correction, deletion, portability, objection, restriction or withdrawal of consent. Contact the developer for information held by the developer and Google or the relevant provider for information they control. You may also contact your local supervisory authority.

7. Younger users and regional privacy protections

The intended audience includes 16- and 17-year-olds as well as adults. The app does not require an account, date of birth, identity document or age-verification screen. The intended minimum age and the store's audience declaration are not verification of any individual user's age and do not establish that every user can independently consent to every type of processing in every country.

The applicable age of digital consent, parental involvement requirements and restrictions on advertising to minors depend on the location and processing involved. UMP manages the privacy choices supported by Google's configured messages; it does not independently verify age or parental authority. The app applies Google's teen age treatment and a G maximum ad content rating to all advertising requests, including requests from adults, before initializing the advertising SDK. It also explicitly requests non-personalized ads. Google states that teen treatment disables personalized advertising and remarketing and applies teen ad-serving protections. If the protection configuration fails or remains unconfirmed, the app does not initialize the advertising SDK or load ads. These settings do not verify age, suppress all advertising identifiers, replace consent or establish compliance in every country. The app does not infer an individual's age from the store audience selection or use a blanket under-age-of-consent flag to bypass UMP forms. Distribution and advertising availability must be limited where additional safeguards are required. See Google age-treatment documentation.

Younger users should take care before exporting practice information or sending support messages and seek help from a parent or guardian when appropriate. If you believe a younger user has sent personal information to the developer, contact the privacy email above. Information held only on the device, information sent to the developer and information processed by Google or another destination must be managed separately as explained in this policy. This app does not provide a verified parental-consent workflow.

8. Security, international processing and updates

Keep your device and backups secure and use care when sharing files. No storage or transmission method is guaranteed completely secure. Google, hosting, email and services you choose may process information in countries other than your own, under their applicable policies and safeguards. We will update this policy and its date when practices change and provide additional notice or obtain consent where required.