Privacy Policy

Last updated: March 26, 2026

Hanzio ("Hanzio," "We," "Us," "Our") is operated from Spain and respects your privacy and is committed to protecting it through our compliance with this policy. This document details the types of information we may collect or that you may provide when you access, use or register with Hanzio's website and mobile application (collectively "Services") and our practices for using, maintaining, protecting and disclosing that information.

Please read this carefully to understand our policies and practices regarding your information and how we will treat it. By using or registering with our Services, you agree to this Privacy Policy. Your continued use of our Services after we make changes is deemed to be acceptance of those changes, so please check the policy periodically for updates as it may change from time to time.

Information We Collect and How We Collect It

We collect information from and about users of our Services:

• Directly from you when you provide it to us.
• Automatically when you use the Services.

Information You Provide to Us

When you use or register with the Services, we may ask you to provide information by which you may be personally identified ("Personal Information").

This information includes:

• Name and username: A display name and unique username you choose when creating your account.
• Email address: Used for account authentication, password recovery, and service communications.
• Optional profile data: During onboarding, you may optionally provide your experience level, age range, gender, and how you heard about us. This information is used solely to personalize your learning experience and is not required to use the Services.
• Learning data: Your study progress, vocabulary lists, review history, and learning preferences.
• Payment information: If you subscribe to premium features, payment is processed by third-party platforms (Apple App Store, Google Play Store). Hanzio does not store your credit card or payment details.
• Community contributions: If you choose to contribute content to the community — such as mnemonics, proposed meanings, example sentences, or votes — we store the contributed content and associate it with your account for moderation purposes. On account deletion, your authorship is anonymized (author link removed) but the contributed content remains.

Automatic Information Collection

When you download, access or use the Services, we may automatically collect:

• Usage Details: Information about how you use the app, including study sessions, features accessed, and learning progress. We use Firebase Analytics to collect this data to improve our Services.
• Device Information: We may collect information about your mobile device, including device type, operating system, and unique device identifiers.
• Crash Reports: We collect crash and error reports to identify and fix technical issues.
• Advertising data: For free (non-premium) users, we display ads through Google AdMob. AdMob may collect device identifiers, IP address, and usage data to serve ads. Ads are limited to general-audience content. Premium subscribers do not see ads and this data is not collected for them. In the European Economic Area, we obtain your consent before serving personalized ads through a consent form displayed within the app. You can change your ad preferences at any time in the app's privacy settings. On iOS, you may also be asked for permission to track your activity across apps. You can opt out of personalized ads at any time through the app's privacy settings or your device settings. See Google's privacy policy for more details.
• AI-assisted features: Certain features use third-party AI services (such as OpenAI or Anthropic) to generate mnemonic aids from dictionary data (character component meanings) and to translate example sentences when you request a translation. These requests contain only dictionary and learning content — no personal user data is included. The AI providers may process this content in accordance with their own privacy policies.
• On-device processing: Handwriting recognition is processed on your device using Google ML Kit. Text-to-speech uses your device's built-in speech services. These features do not send your handwriting or audio data to external servers.

Use of Personal Information We Collect

We may use the information we collect from you in the following ways:

• To provide our Services: Setting up your account, syncing your learning progress across devices, and delivering the core functionality of Hanzio.
• To personalize your experience: Adapting content and spaced repetition scheduling based on your learning progress and preferences.
• To improve our Services: Analyzing usage patterns to enhance our spaced repetition algorithms, fix bugs, and develop new features.
• To communicate with you: Sending service-related messages, including account confirmations, technical notices, updates, security alerts, and support messages.
• To process transactions: Facilitating purchases through third-party payment platforms.

All data we collect is necessary for us to deliver the services you use. The amount we collect has been minimized wherever possible to respect your privacy.

Legal Basis for Processing (GDPR)

Under the General Data Protection Regulation, we process your personal information based on the following legal grounds:

• Contract performance: Processing necessary to provide you with the Services, including account creation, data synchronization, spaced repetition scheduling, and core learning features.
• Legitimate interest: Processing necessary for our legitimate interests, such as analyzing usage patterns to improve our Services, fixing bugs, ensuring security, and preventing fraud — where these interests are not overridden by your data protection rights.
• Consent: Processing based on your explicit consent, such as optional demographic data provided during onboarding, personalized advertising for free users (where consent is required by law), and marketing communications (when applicable). You may withdraw your consent at any time.
• Legal obligation: Processing necessary to comply with legal requirements, such as tax and financial record-keeping.

How We May Share Information We Collect

We may share personal information as follows:

• With service providers: Third-party services that help us operate our Services, such as Firebase (analytics and authentication), RevenueCat (subscription management), and payment processors (Apple, Google).
• With advertising partners: For free (non-premium) users, we share data with Google AdMob to display ads. AdMob may use device identifiers and usage information to serve relevant ads. We do not share your learning data or personal details with advertisers.
• For refund processing: If you request a refund for an in-app purchase, we may share data regarding your usage and consumption of purchased content with Apple to help resolve the refund request.
• For legal reasons: To respond to lawful requests and legal processes, or to protect the rights, property, and safety of Hanzio, our users, or the public.
• Business transfers: In the event that Hanzio is acquired or merges with another entity, your information may be transferred. We will notify you of any such change.

We do not sell your personal information to third parties.

Data Retention

We retain personal information for as long as your account is active or as needed to provide you services. If you delete your account, we will delete or anonymize your personal information, except where we need to retain certain information for legitimate business or legal purposes (such as financial records).

Community contributions are retained even after account deletion, with authorship anonymized.

Security of Your Personal Information

The security of your Personal Information is important to us. We use industry-standard security measures to protect your data, including:

• Secure authentication through Firebase Authentication
• Encrypted data transmission (SSL/TLS)
• Secure cloud storage through Google Cloud/Firebase

Please be aware that no method of transmission over the Internet or electronic storage is 100% secure. While we strive to protect your Personal Information, we cannot guarantee its absolute security.

If you use a password on the Services, you are responsible for keeping it confidential. Do not share it with any other person. If you believe your password has been compromised, please change it immediately or contact us.

Your Data Protection Rights Under The General Data Protection Regulation (GDPR)

If you are a resident of the European Economic Area (EEA), you have the following data protection rights:

• Access: You may request access to the personal information we hold about you.
• Correction: You may request that we correct any inaccurate or incomplete personal information.
• Deletion: You may request that we delete your personal information. Note: Community contributions that you have shared cannot be deleted, as they form part of the shared community resource. Your authorship will be anonymized upon request.
• Restriction: You may request that we restrict the processing of your personal information.
• Portability: You may request a copy of your personal information in a structured, machine-readable format.
• Objection: You may object to our processing of your personal information.
• Withdraw consent: If we process your personal information based on your consent, you may withdraw that consent at any time.

To exercise any of these rights, please contact us at support@hanzio.app. We will respond to your request within 30 days.

You also have the right to complain to a data protection authority about our collection and use of your personal information.

Your Data Protection Rights Under the California Consumer Privacy Act (CCPA/CPRA)

If you are a California resident, the California Consumer Privacy Act, as amended by the California Privacy Rights Act ("CCPA/CPRA"), provides you with specific rights regarding your Personal Information:

• Right to know: You may request that we disclose the categories and specific pieces of Personal Information we have collected about you.
• Right to delete: You may request that we delete Personal Information we have collected from you.
• Right to correct: You may request that we correct inaccurate Personal Information we hold about you.
• Right to limit use of sensitive personal information: You may request that we limit the use and disclosure of your sensitive Personal Information.
• Right to non-discrimination: We will not discriminate against you for exercising your CCPA/CPRA rights.

To exercise your CCPA/CPRA rights, please contact us at support@hanzio.app.

Children's Privacy

Hanzio is an educational application. If you are under 13, you may only use our Services with the involvement and consent of a parent or legal guardian. We do not knowingly collect personal information from children under 13 without parental consent.

If you are a parent or guardian and believe your child under 13 has provided us with personal information without your consent, please contact us at support@hanzio.app and we will delete such information.

For users in the European Union, we do not knowingly collect personal information from anyone under the age of 16 without parental consent.

International Data Transfers

Your information may be transferred to and processed in countries other than your country of residence. These countries may have data protection laws that are different from the laws of your country.

When we transfer your personal information internationally, we will take appropriate safeguards to protect your information in accordance with this Privacy Policy and applicable law.

Push Notifications and Communications

We may send you push notifications related to the Services, such as study reminders and streak alerts. You can disable push notifications at any time through your device settings.

We will only send marketing or promotional communications with your explicit opt-in consent. You can opt out of marketing emails at any time by using the unsubscribe link in any marketing email or by contacting us.

Third-Party Links

Our Services may contain links to third-party websites or services. We are not responsible for the privacy practices of these third parties. We encourage you to read the privacy policies of any third-party services you use.

Changes to This Privacy Policy

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page and updating the "Last Updated" date.

You are advised to review this Privacy Policy periodically for any changes. Changes are effective when they are posted on this page.

Contact Us

Hanzio is the data controller responsible for your personal information. If you have any questions about this Privacy Policy, wish to exercise your data protection rights, or would like to have your information deleted from our database, please contact us at:

Email: support@hanzio.app

Website: https://hanzio.app

Location: Spain

For EU residents, you may also use the European Commission's Online Dispute Resolution platform at https://ec.europa.eu/consumers/odr.

This Privacy Policy was last updated on March 26, 2026.