Privacy Policy

Last Updated: September 27, 2026

1. Introduction

This Privacy Policy describes how the WBuch Language Learning Application (”WBuch”, “we”, “us” or “the App”) collects, uses, discloses, and protects your personal information. This policy applies to all users of WBuch on the Apple App Store, Google Play Store, and the WBuch web application. By using WBuch, you agree to the collection and use of information in accordance with this Privacy Policy. We are committed to protecting your privacy and complying with applicable data protection regulations.

2. Information We Collect

We limit our data collection to the minimal information necessary to provide and improve our services. The personal data we collect includes:

• Email Address – Collected when you create an account or sign in. Used for account identification, authentication, and communication (e.g., account verification or password recovery).
• Device Identifiers – This includes device ID or advertising ID and similar unique identifiers associated with your smartphone or browser. These are used for features like push notifications and analytics, and to ensure your account is recognized across your devices.
• Authentication Tokens – Secure tokens or credentials generated upon login (for example, session tokens or OAuth identifiers). These allow you to stay logged in and access your account securely without re-entering your password.
• User-Provided Content (Word Lists and Progress) – Any language word lists, vocabulary entries, or other learning content you voluntarily input into the App. This data is stored so that you can access, practice, and manage your personalized learning materials across sessions.

In addition to the above, we may collect certain automated information through third-party analytics services when you use WBuch, such as your device type, operating system version, IP address, general location (country or region), and usage statistics (e.g., features used, time spent). This information is collected to help us understand how the App is used and to improve its performance, and it does not directly identify you by name. We do not collect any sensitive personal data such as government IDs, payment card numbers, or health information.

3. How We Use Your Information

We use the collected information for the following purposes in accordance with applicable laws:

• Providing and Improving the Service: Your email and authentication data are used to create and maintain your account, log you in securely, and sync your learning progress. Your word lists and usage data are utilized to deliver personalized learning content and track your progress.
• AI-Powered Content Generation: WBuch offers AI-based language content and exercises. This means that some of your provided data (such as words on your study list or in-app queries) may be processed by our content generation engine to create personalized exercises or translations. Any such processing is done through trusted third-party AI services on our behalf, solely to generate content for your learning, and the data is not retained by those services beyond this purpose.
• Voice Synthesis (Text-to-Speech): To enhance your learning experience, the App can convert text into spoken audio (pronunciations). For this feature, the text (e.g. words or phrases you select) may be sent to a third-party voice synthesis service, which returns the audio. No personally identifying information is included in these requests — only the text to be spoken.
• Push Notifications: If you grant permission, we will send you push notifications and alerts, for example to remind you to practice, inform you of new content, or other relevant updates. Device identifiers or tokens are used to deliver these notifications. You can opt out of push notifications at any time via the App settings or your device’s notification preferences.
• Advertising: The App displays advertisements to support our free offering. We work with third-party advertising networks that may use device identifiers and contextual data (such as your general location or the content you are viewing in the App) to serve relevant ads. We do not share your email or any sensitive personal data with advertisers. If you are under the age of 13 (or a higher age threshold applicable in your region), we take steps to disable or limit personalized ad tracking in compliance with child privacy regulations (see Children’s Privacy below).
• Analytics and Crash Reports: Only if you agree, we collect pseudonymous information about how the App is used (for example, which screens are opened and how exercises go) and reports when the App crashes. This helps us troubleshoot issues, analyze usage trends, and improve the App’s design and content. The App asks for this consent once on each device before you sign in, and nothing is collected until you answer; see “Firebase Analytics and Firebase Crashlytics” in Section 4. On the website wbuch.com the same applies to Google Analytics via the cookie banner.
• Communications: We may use your email to send important account or service-related messages, such as account verification, password reset emails, or updates about significant changes to the App or this Policy. We may also send occasional product updates, newsletters, or promotional offers, but only if you have opted in to such communications. You can unsubscribe from marketing emails at any time by using the unsubscribe link in those emails or contacting us.
• Security and Fraud Prevention: Information like device IDs and IP addresses may be used to protect against fraudulent usage, secure user accounts, and enforce our terms of service.
• Legal Compliance: We may process and disclose your data when required to by law or lawful requests by public authorities (e.g., to comply with a subpoena or similar legal process), or when we believe in good faith that disclosure is necessary to protect our rights, protect your safety or the safety of others, investigate fraud, or respond to a government request.

We will not use your personal data for any purposes that are incompatible with the purposes outlined above without obtaining your consent, and we do not engage in any form of automated decision-making that produces legal effects concerning you or similarly significantly affects you, solely based on the automated processing of data.

4. Third-Party Services and Sharing

WBuch integrates several third-party services to provide core functionalities. These providers are carefully chosen and are given access only to the information necessary to perform their specific services . We ensure that all third-party partners are bound by contractual obligations to protect your data and to comply with privacy laws. The categories of third-party services we use include:

• Authentication Services: We may use a secure third-party authentication provider to manage account sign-ups and logins (for example, if you choose to sign in using an external account or our own authentication system backed by a cloud service). This provider handles your login credentials and provides us a unique user ID and email, which we use to identify your account. Your passwords are not visible to us and are stored by the authentication service in an encrypted form.
• AI Content and Voice Service Providers: As noted, we rely on external artificial intelligence services for content generation and text-to-speech functionality. These service providers receive only the data needed to perform the task (e.g., a block of text to transform into a language exercise or spoken audio) and are not permitted to use it for any other purpose. They do not receive your account information or any unnecessary data.
• Push Notification Platform: We use a third-party messaging service (e.g., Apple Push Notification Service for iOS devices, Firebase Cloud Messaging for Android, or a similar service) to send you push notifications. This service uses device tokens or IDs to route notifications to the correct device. No sensitive personal content is included in the notifications themselves — they are simply messages we compose (such as “Practice your daily lesson!”). You can control these notifications as described above.
• Advertising Networks: Third-party advertising partners display ads within WBuch. These partners may collect certain device information (such as Advertising ID, IP address, and device type) to serve non-intrusive, appropriate ads. We implement these services in compliance with platform policies (including Google Play and Apple App Store requirements). If required, we will ensure that no behaviorally targeted ads are shown to users identified as children or general audience users where such targeting would violate applicable policies . We do not share any directly identifying personal data (such as your name or email) with advertisers.
• Firebase Analytics and Firebase Crashlytics (WBuch app): In the WBuch app for Android and iOS and in the web app at app.wbuch.com we use Google Analytics for Firebase and, in the Android and iOS apps, Firebase Crashlytics. Both are provided by Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland (“Google”). When you open the App for the first time on a device or in a browser, it asks whether you allow anonymous usage statistics and crash reports. Until you answer, and if you choose “Don’t allow”, both services stay switched off and no data is sent to Google.
  If you choose “Allow”, Firebase Analytics processes a pseudonymous app-instance identifier, the screens you open and actions in the App (for example, exercises started and completed, answer results, words added to your study list identified by their dictionary entry number, settings you change), your device model, operating system, app version and language, and your approximate location (country or region) derived from your IP address. Firebase Crashlytics processes crash reports: the technical state of the App and device at the time of the crash (stack trace, device model, operating system, free memory and similar). Both services receive our internal numeric account ID, so that usage and crash data can be related to the learning progress stored on our own servers; they never receive your email address, your name, or the text of your words, notes or reading texts.
  We use this information only to find errors and to understand how the App is used in order to improve it. It is not used for advertising, and collection of the Android advertising ID is disabled; the App does not ask for tracking permission on iOS, so the iOS advertising identifier is not available to it. Legal basis: your consent (Art. 6(1)(a) GDPR and § 25(1) TDDDG). Google may process data in the United States; Google LLC is certified under the EU-U.S. Data Privacy Framework. You can withdraw your consent at any time in the App under Settings → “Help improve the app”; collection stops immediately. Withdrawal does not affect the lawfulness of processing carried out before it. More information: Privacy and Security in Firebase, Google Privacy Policy.
• Google Analytics (website wbuch.com): On the WBuch web dictionary at wbuch.com we use Google Analytics 4, a web analytics service provided by Google Ireland Limited, Gordon House, Barrow Street, Dublin 4, Ireland (“Google”). Google Analytics is loaded only after you click “Accept” in the cookie banner; if you decline or make no choice, no data is sent to Google. When enabled, Google Analytics processes a pseudonymous cookie identifier, the pages you open, the words you enter in the dictionary search, your browser and device type, and your approximate location (country or region) derived from your IP address; Google Analytics 4 does not log or store IP addresses. We use this information only to understand how many people use the dictionary and what they look up. Legal basis: your consent (Art. 6(1)(a) GDPR and § 25(1) TDDDG). Google signals and ad personalization are disabled, and the data is not used for advertising. Google may process data in the United States; Google LLC is certified under the EU-U.S. Data Privacy Framework. You can withdraw your consent at any time via the “Cookie settings” link at the bottom of every page of the dictionary. More information: Google Privacy Policy.
• Cloud Storage and Server Infrastructure: WBuch is backed by secure cloud servers and storage services (within the European Union – see Data Storage & Security below). These third-party data hosting providers store our application data (including your personal data) on our behalf. They are contractually bound to maintain strict confidentiality and security of the data. We do not allow these providers to access your data for any purpose other than secure storage, backup, and retrieval as needed to run the App.
• Payment Processors: Note: All purchases in WBuch (such as subscription upgrades or in-app purchases, if any) are processed exclusively through the Apple App Store or Google Play Store’s payment systems. We do not directly collect or store your financial information for these transactions. This means that when you make a purchase, you provide payment details (e.g., credit card or account credentials) to Apple or Google, not to WBuch. These platform providers may give us a confirmation that a payment was made and a basic record of the transaction (e.g. an order ID and product purchased), but we never receive your full payment account information. In other words, we delegate all financial transactions to the app store providers, who handle and secure your payment data; WBuch itself cannot access your credit card number or billing information .

Sharing of Information: We do not sell your personal data to any third parties. We also do not share your personal information with third parties for their own independent marketing purposes. The cases in which we may share data are limited to: (a) sharing with the above-described service providers and partners who need it to perform services on our behalf (under strict data protection agreements), (b) if required by law or to protect legal rights (as described under Legal Compliance in Section 3), or (c) in connection with a merger, acquisition, or sale of all or a portion of our assets (in which case we will provide notice and choices as required by law). Any sharing of data is done in compliance with applicable privacy laws and only after ensuring appropriate safeguards are in place.

5. Cookies and Similar Technologies

This section describes the cookies and similar technologies used on the WBuch web dictionary at wbuch.com. Cookies are small text files stored by your browser; local storage is a similar storage area in your browser.

Necessary and preference storage (no consent required). These entries only remember choices you make on the site and are never used to track you:

• dict_lang and dict_ui_lang (cookies, 1 year): the translation language and the interface language you selected.
• dict_theme (local storage, until you clear it): the light or dark theme.
• wbuch_consent (local storage, 12 months): your choice in the cookie banner, so that we do not ask again on every page. After 12 months we ask again.

Analytics cookies (only with your consent). If you click “Accept” in the cookie banner, Google Analytics sets the cookies _ga and _ga_<ID> to tell visits apart (lifetime 13 months). See “Google Analytics” in Section 4 for details. If you decline, these cookies are not set and Google Analytics is not loaded at all.

Withdrawing consent. You can change or withdraw your choice at any time via the “Cookie settings” link at the bottom of every page of the dictionary; when you withdraw consent, the Google Analytics cookies are deleted. Withdrawal does not affect the lawfulness of processing carried out before it.

Website statistics without cookies. Our own server counts, per day, how many times dictionary pages are opened and how many searches are made. Only these daily totals are stored — no IP addresses, no cookies and no identifiers — so they contain no personal data.

No other third-party requests. The dictionary’s fonts and styles are served from our own servers, so opening a page does not send your IP address to font providers or other third parties.

Local Storage & Device Storage: In addition to cookies, the WBuch mobile apps and web may utilize local storage or similar mechanisms on your device to cache data and store preferences (for example, saving a list of words for offline practice, or remembering that you have seen a particular tutorial so as not to show it again). This local data is stored on your device and never uploaded to our servers unless necessary for syncing your account. It is used to improve speed and provide offline capabilities. You can typically clear an app’s stored data by uninstalling the app or, for the web, by clearing your browser’s site data.

You can also block or delete cookies in your browser settings. Blocking the preference cookies only means that the site will not remember your language choice.

WBuch app (Android, iOS and app.wbuch.com). The App stores your answer to the analytics question on the device (in the browser’s local storage for the web app) so that it is asked only once. Only if you choose “Allow”, Firebase Analytics stores a pseudonymous app-instance identifier on the device; in the web app it does so in the cookies _ga and _ga_<ID> (lifetime 13 months). See “Firebase Analytics and Firebase Crashlytics” in Section 4.

6. Data Storage and Security

Storage Location: All personal data and content you provide to WBuch is stored securely on servers within the European Union. We maintain this within the EU to ensure compliance with robust data protection standards and to facilitate easier oversight under European privacy regulations. We implement strict policies so that your data stays in protected environments at all times .

Security Measures: We are committed to safeguarding your information. In line with industry best practices and legal requirements, we employ a variety of technical and organizational measures to protect your personal data from unauthorized access, alteration, disclosure, or destruction . These measures include, but are not limited to:

• Encryption: All data transmitted between your device and our servers is encrypted using security protocols such as SSL/TLS. This means that when you enter personal information in the app or on the website, it is coded in a way that prevents eavesdropping during transit. We also encrypt sensitive data at rest on our servers where feasible, adding an extra layer of protection .
• Access Controls: We restrict access to personal data to authorized personnel who need it to operate, develop, or improve the App. Those who have access are bound by strict confidentiality obligations. Administrative access to systems storing personal data is protected via strong authentication (e.g., multi-factor authentication) and is logged for security review.
• Secure Infrastructure: Our servers are protected by up-to-date firewall protection and housed in secure facilities with 24/7 monitoring. We regularly update our software and employ malware protection to guard against vulnerabilities.
• Data Minimization: We only collect data that is necessary for the purposes stated. By limiting what we store, we reduce the risk associated with your personal information.
• Periodic Reviews and Testing: We periodically review our information collection, storage, and processing practices to ensure they are secure. We perform security testing and assessments on our applications and backend systems.
• Anonymization: Where possible, especially for analytics and research, we use anonymization or pseudonymization. For instance, usage logs for analytics are stored without directly identifying information, and any AI processing is done on data that does not directly identify users.

Despite our best efforts and the measures in place, no system can be 100% secure. We cannot guarantee absolute security of your data (no reputable service can), but we do continuously work to protect your information. In the unlikely event of a data breach that affects your personal data, we will notify you and the relevant regulatory authorities as required by law, and we will take all reasonable steps to mitigate any potential harm.

7. Data Retention

We retain your personal information only for as long as necessary to fulfill the purposes for which it was collected, including for the purposes of satisfying any legal, accounting, or reporting requirements . In practice, this means:

• Account Data: Your email, authentication credentials, and profile data are kept for as long as you maintain an account with WBuch. If you decide to delete your account (or request us to do so), we will initiate deletion of these records from our live databases (as described in Section 9: Your Rights).
• User-Provided Content: Word lists and other study materials you add are retained so long as you are using the service (they are part of your account). If you remove specific content from within the app (e.g., delete a word list), it will no longer be accessible to you or the app, and we will expunge or anonymize that content from our systems within a reasonable time frame as part of routine clean-up (backups may retain it for a short period – see below).
• Analytics Data: Aggregated analytics and log data may be retained for internal analysis and security purposes. Generally, this data is either anonymized or associated with a pseudonymous ID. We may retain anonymous usage statistics indefinitely to help us understand long-term usage trends, but such data will not be linked to an individual once the retention period for personal data expires. Google Analytics data from the website is retained by Google for 2 months and then deleted automatically. Firebase Analytics data from the App is likewise retained for 2 months, and Firebase Crashlytics keeps crash reports for 90 days. The server-side daily page and search totals contain no personal data and may be kept indefinitely.
• Backups: Like many services, we perform regular backups of our databases to ensure resilience against system failures. These backups are securely stored and encrypted. Personal data that you have deleted or that we have removed may remain in encrypted backups for a short period (typically no more than 30 days) before being automatically overwritten or purged. During this period, we would not restore deleted personal data unless absolutely necessary for system integrity, and if so, we would re-delete the data after restoration.
• Legal Requirements: In certain cases, we may need to retain some information for longer if required by applicable laws (for example, records of transactions or correspondence may be kept to comply with financial regulations or dispute resolutions). In all such cases, we will only retain the minimum necessary information and for the shortest duration required by law.

Once the retention period expires or upon confirmed deletion of your data, we either securely erase your personal information or anonymize it so that it can no longer be associated with you.

8. Your Rights

WBuch is committed to upholding the data subject rights provided under international data protection laws, including the EU General Data Protection Regulation (GDPR). As a user, you have the following rights regarding your personal data that we hold:

• Right of Access: You have the right to request confirmation of whether we are processing your personal information, and if so, to request a copy of the data we hold about you . We will provide this information, subject to some exceptions (for example, if providing the data would adversely affect the rights and freedoms of others).
• Right to Rectification: If any of your personal data is inaccurate or incomplete, you have the right to request that we correct or update it . You can also correct certain information (like your email) directly through the account settings in the App.
• Right to Erasure: You have the right to request deletion of your personal data under certain circumstances – for example, if the data is no longer necessary for the purposes it was collected, or if you withdraw consent and no other legal basis for processing exists . See Section 9 (Data Deletion) for more details on how to delete your account and data.
• Right to Object: You have the right to object to our processing of your personal data in certain situations. For instance, you can object to processing for direct marketing or to any processing based on our legitimate interests if you believe it infringes on your rights . If you object, we will consider your request and whether our processing should be adjusted or terminated, except where we have compelling legitimate grounds to continue.
• Right to Restrict Processing: You can request that we limit the processing of your data in specific cases – e.g., while we are verifying the accuracy of your data after you contest its accuracy, or if you want us to preserve data for legal reasons while a complaint is pending. When processing is restricted, such data will be marked accordingly and, aside from storage, will only be processed with your consent or for legal reasons.
• Right to Data Portability: You have the right to receive the personal data you provided to us in a commonly used, machine-readable format, and to have that data transmitted to another service provider where technically feasible . For example, if you want a copy of your word lists or other content to use in another application, we will provide you with an export if you request it.
• Right to Withdraw Consent: If we rely on your consent to process any personal data (such as sending marketing emails), you have the right to withdraw that consent at any time . Withdrawing consent will not affect the lawfulness of any processing we conducted prior to your withdrawal, and it will not affect processing of your personal data under other legal bases (for example, processing necessary for the performance of a contract or compliance with a legal obligation).
• Right to Non-Discrimination: If you choose to exercise any of the rights above, we will not discriminate against you for doing so. You will continue to have access to the App and its features under the same conditions as all users, subject to the data adjustments resulting from your request (for example, if you request deletion, of course, you will no longer be able to access your account).

To exercise your rights, you can contact us at our support email (provided in Section 12: Contact Us). For certain requests, we may need to verify your identity (for example, by confirming control of your email account) to prevent unauthorized access to your data. We will respond to your request within a reasonable timeframe, and in any event within any timeframe required by law (GDPR typically requires within one month for most requests). If we cannot comply with your request, we will provide an explanation (for instance, if you request deletion of data which we are required by law to keep, we will inform you of that obligation).

Additionally, if you believe our handling of your personal data violates any applicable law, you have the right to lodge a complaint with a supervisory data protection authority. If you are in the European Union, this would be the authority in your country of residence. We would, however, appreciate the chance to address your concerns directly first, so we encourage you to contact us with any concerns.

9. Data Deletion and Account Termination

You have the option to delete your WBuch account and all associated personal data at any time. We provide a straightforward process to do so:

• In-App Deletion: You can initiate account deletion by using the account deletion feature available in the App’s account settings. This feature will guide you through the process and ask for confirmation before permanently erasing your data.
• Web Deletion Page: If you do not have access to the App, our account deletion page WBuch Account Deletion explains how to delete your account in the App and how to request deletion by email from the address you registered with.
• Contacting Support: You may also request deletion by contacting us via email at mobile.binomv@gmail.com. Please include the email associated with your account and a clear request to delete your data. For security, we may ask you to perform certain steps or provide information to confirm the request.

Effect of Deletion: Once you confirm that you want to delete your account, we will deactivate your account and begin the deletion process. Your profile information, email, and authentication tokens will be removed from our user database. All of your personal content (word lists, progress data, etc.) will be expunged from our systems as well. We aim to complete the deletion of your data promptly, typically within 30 days of receiving a verified deletion request . This period allows us to ensure that we can fulfill any ongoing services you might cancel and to accommodate our next scheduled secure data erasure cycle (including removal from backups as described in Section 7).

After deletion, your data cannot be recovered. This means that if you change your mind later, we will not be able to restore your account or any of your content – you would need to create a new account and start fresh. We thus advise you to back up any data you wish to keep (e.g., export your word lists) before initiating deletion.

In some cases, we may retain certain minimal information even after account deletion if required for legal compliance or legitimate business purposes – for example, records of purchases (without personal identifiers) for financial accounting, or logs indicating that a deletion occurred (to demonstrate compliance). However, such information, if any, will not be used to identify you or for any active service purposes, and will be kept only for the duration necessary to fulfill those obligations.

10. Children’s Privacy

WBuch is rated 3+ on Google Play and 4+ on the Apple App Store, indicating that its content is suitable for all ages, including children. We do not present any inappropriate content in the App, and we strive to make the learning experience safe and enjoyable for users of all ages. However, protecting the privacy of young users is especially important. In line with child privacy laws and platform requirements:

• No Personal Data from Children Under 13: We do not knowingly collect personal information from children under the age of 13 (or under the applicable age of digital consent in your region, if different) without verifiable parental consent. Our application is not designed to solicit personal details from young children beyond what is reasonably necessary to use the app (for example, an email for account creation, which in the case of a child should be done by a parent or guardian). If you are under 13, please do not register an account or submit personal information to WBuch without your parent or guardian’s involvement.
• Parental Account Control: We recommend that parents or guardians create and manage accounts for minors using WBuch. Parents should supervise their child’s use of the App, especially when creating any user-generated content like word lists, to ensure no personal details are being shared.
• Compliance with Family Policy: For users identified as underage, WBuch adheres to the Google Play Families Policy and similar guidelines. This means, for example, we disable any behavioral advertising or personalized ads for such accounts and strictly limit data collection to what is necessary for the app’s operation . Any third-party SDKs or services integrated into WBuch that could affect child users are reviewed for compliance with family-friendly standards .
• Educational Content: The AI-based content generation and voice features are designed to provide age-appropriate language learning material. We do not allow user-generated chat or free-form communication between minors and unknown parties through the App. The AI does not solicit personal information from users.
• If We Learn of Child Data Collection: In the event we discover that we have inadvertently collected personal information from a child under 13 without proper consent, we will take immediate steps to delete that information from our servers. If you are a parent or guardian and believe that your child under 13 has provided us personal information without your consent, please contact us at mobile.binomv@gmail.com, and we will promptly investigate and address the issue.

By using WBuch, you affirm that you are either (i) at least the age of majority in your jurisdiction (typically 18 years or older), or (ii) if you are under the age of majority, that you are using the App with the consent and supervision of your parent or legal guardian . If you are a parent or guardian, by allowing your child to use WBuch, you agree to this Privacy Policy on the child’s behalf and you consent to our collection and use of the child’s information as described in this Policy.

11. Changes to This Privacy Policy

We may update or revise this Privacy Policy from time to time to reflect changes in our practices, technologies, legal requirements, or for other operational reasons. If we make material changes, we will notify you through appropriate channels – for example, by posting a notice within the App, updating the “Last Updated” date at the bottom of this Policy, and/or emailing you (if you have provided an email) to explain the changes.

We encourage you to review this Privacy Policy periodically to stay informed about how we are protecting your information. The latest version of the Privacy Policy will always be available within the App (in the settings or legal section) and on our website. Your continued use of WBuch after any changes to this Privacy Policy constitutes your acceptance of the updated terms. If you do not agree with any updates or modifications, you should stop using the App and may request deletion of your data as described above.

12. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or your personal data, please do not hesitate to contact us:

• Email: mobile.binomv@gmail.com
• Contact Person: Vladimir Ivanov
• Postal Address: Mehrower Allee 30, 12687 Berlin, Germany

Provider identification: Impressum.

We will do our best to respond promptly to your inquiries and resolve any concerns. Your privacy is important to us, and we welcome feedback on any aspects of this Policy or our practices.

By using the WBuch application, you acknowledge that you have read and understood this Privacy Policy. Thank you for trusting WBuch with your language learning journey. We are dedicated to protecting your privacy and creating a safe, enjoyable learning experience for everyone.