Privacy Policy

Effective Date: July 18, 2025

Last Updated: February 12, 2026

This Privacy Policy explains how the Lingible app (hereinafter referred to as the "App", "we", or "us") collects, uses, and protects the personal information of its users (hereinafter referred to as "user" or "you").

1. Information We Collect

The Lingible app may collect the following types of information:

1.1 Technical Data

Device type, operating system version, system language, crash reports, and app usage analytics (via analytics tools).

1.2 User Data

Uploaded book files, saved words, user preferences. This data is stored locally on the user's device and/or in the cloud (if syncing is enabled).

1.3 Book Text Content for AI Processing

When you use AI-powered features in the app (such as translations, summaries, or explanations), portions of your book text content are sent to third-party AI service providers to process your requests. Specifically:

  • Data Sent: Selected text excerpts from books you are reading, limited to the specific passages you interact with
  • Recipients: OpenAI (ChatGPT API) and/or other AI service providers
  • Purpose: To provide AI-powered reading assistance features including translations, word definitions, text summaries, and context explanations
  • User Control: You can choose whether to use AI features. Text is only sent when you actively request AI assistance
  • Data Protection: Our AI service providers maintain strict data protection standards and do not use your data to train their models or for any purposes other than providing the requested service
  • No Personal Information: Only book text content is shared; no personal identifying information, account details, or metadata is included

1.4 Payment and Subscription Information

When you purchase a subscription, we may collect and process payment information through third-party payment processors (such as Apple App Store or Google Play Store). We do not directly store your payment card information. The payment processors collect:

  • Transaction details
  • Subscription status and type
  • Purchase history
  • Billing information as required by the payment processor

2. How We Use the Information

The collected data is used for the following purposes:

  • To ensure the functionality and performance of the app
  • To improve the quality of our services
  • To provide technical support to users
  • To enhance user experience
  • To analyze app usage for internal (non-personalized) statistics
  • To process and manage subscriptions and payments
  • To send transactional emails related to your subscription (receipts, renewal notices, expiration warnings)
  • To prevent fraud and ensure secure transactions
  • To provide AI-powered reading features: Book text excerpts are sent to AI service providers only when you actively use AI features (translations, summaries, definitions). We obtain your permission before sending any text data to AI services

3. Sharing Information with Third Parties

We do not share your personal data with third parties, except in the following cases:

  • Legal Requirements: As required by applicable law, court order, or governmental regulation
  • Analytics Services: With analytics services (e.g., Google Firebase, Sentry) — in anonymized form only
  • Payment Processors: With payment service providers (Apple App Store, Google Play Store) to process subscription payments and manage billing
  • AI Service Providers: Book text excerpts are shared with AI service providers (such as OpenAI) only when you actively use AI-powered features. Before any data is sent, the app will:
    • Clearly disclose what text content will be sent
    • Identify the AI service provider receiving the data
    • Request your explicit permission to proceed
    These AI service providers maintain data protection standards equivalent to or exceeding ours and are contractually obligated to use the data solely for providing the requested service. They do not use your book text to train AI models or for any other purpose.
  • Service Providers: With trusted third-party service providers who assist us in operating our app, conducting our business, or servicing you, as long as those parties agree to keep this information confidential

4. Data Storage and Protection

We take all reasonable measures to protect your information using industry-standard security measures. However, we cannot guarantee absolute security. Users are responsible for protecting their own data and devices.

Your data is stored:

  • Locally on your device
  • In secure cloud storage (if cloud sync is enabled)
  • On secure servers maintained by our third-party service providers

We retain your personal information only for as long as necessary to provide you with our services and as described in this Privacy Policy. Subscription and payment data may be retained for longer periods as required by law or for legitimate business purposes.

5. User Rights

Users have the right to:

  • Request deletion of their data
  • Withdraw consent to data processing
  • Request information about stored data
  • Access and receive a copy of their personal data
  • Correct or update inaccurate personal information
  • Object to processing of their personal data
  • Request restriction of processing under certain circumstances

To exercise your rights, please contact us at: lingible.app@gmail.com

6. Subscriptions and Payments

6.1 Subscription Services

Lingible offers subscription-based premium features. By purchasing a subscription, you agree to pay the fees associated with your selected subscription plan.

6.2 Payment Processing

All payments are processed through third-party payment processors (Apple App Store for iOS devices, Google Play Store for Android devices). We do not directly handle or store your payment card information.

6.3 Automatic Renewal

Subscriptions automatically renew unless you cancel before the renewal date. You can manage your subscription and turn off auto-renewal through your device's account settings.

6.4 Cancellation and Refunds

You may cancel your subscription at any time through your device's account settings. Refunds are handled according to the policies of Apple App Store or Google Play Store. Please refer to their respective refund policies for more information.

6.5 Changes to Subscription Plans

We reserve the right to modify subscription prices and features. We will notify you of any changes in advance. Continued use of the service after price changes constitutes acceptance of the new pricing.

7. Policy Changes

We may periodically update this Privacy Policy. When we make changes, we will update the "Last Updated" date at the top of this policy. Updates will be communicated via the app or through other appropriate means. We encourage you to review this Privacy Policy periodically to stay informed about how we are protecting your information.

Continued use of the Lingible app after any changes to this Privacy Policy constitutes your acceptance of such changes.

8. Contact Us

If you have any questions, concerns, or requests regarding this Privacy Policy or our data practices, please contact us at:

Email: lingible.app@gmail.com

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