Fufive Privacy Policy

Last updated: January 2026

1. Introduction

Fufive ("we", "us", or "the App") respects your privacy. This Privacy Policy explains how we collect, use, store, and protect your information. By using the App, you agree to the terms of this Policy.

2. Information We Collect

2.1 Identifiers

• User ID: When you sign in with Apple, we collect a unique user identifier (UID).
• Device ID: We use iOS identifierForVendor (IDFV) to identify your device for syncing and account management.
• Apple ID: If you use Sign in with Apple, we store your Apple userIdentifier (not your real name/email).

Purpose: Account management, data sync, and personalized services.

Used for tracking: No.

2.2 Contact Information

• Email address: If you choose to share it via Sign in with Apple, we may receive your email address.
• Name: If you choose to share it via Sign in with Apple, we may receive your name.

Purpose: Account management and support.

Used for tracking: No.

2.3 User Content

• Audio Data: When you use speech practice, we record audio and may convert it to text.
• Learning Records: Words learned, progress, review history, mastery levels, etc.
• Word Data: Words you input, explanations, example sentences, and notes.

Purpose: Provide learning features, track progress, and personalize recommendations.

Used for tracking: No.

2.4 Usage Data

• Product Interaction: Learning progress, feature usage, frequency, etc.
• Diagnostics: Crash logs, performance data, and error info (to improve the App).

Purpose: Improve features, analyze usage, and fix issues.

Used for tracking: No.

3. How We Use Your Information

• Core functionality: Vocabulary learning, speech practice, progress tracking, data sync.
• Personalization: Recommendations based on your level and progress.
• Improve the App: Analyze usage and fix bugs.
• Support: Respond to your requests.

4. Storage & Security

4.1 Where data is stored

• On-device: Learning data is stored locally (SwiftData).
• Server: If you sign in, your data may be synced to our server.
• Keychain: Sensitive data (e.g., tokens) is stored in iOS Keychain with system encryption.

4.2 Security measures

• We use HTTPS for network communications.
• We store sensitive data in iOS Keychain.
• We apply industry-standard server security measures.
• We regularly review and update security practices.

5. Sharing & Disclosure

We do not sell your personal information. We may share information only in the following cases:

• Service providers: We use OpenAI APIs for AI features (word explanations, speech-to-text, text-to-speech). Relevant data may be sent to OpenAI only to provide the requested features.
• Legal requirements: If required by law.
• Protect rights: To protect our rights, property, or safety.

6. Third-Party Services

6.1 OpenAI

We use OpenAI APIs to provide:

• Word explanations and example sentences
• Speech transcription (Whisper)
• Text-to-speech (TTS)
• Realtime voice conversations

OpenAI's privacy policy: OpenAI Privacy Policy

7. Your Rights

• Access: You can access your information.
• Correction: You can correct inaccurate information.
• Deletion: You can request deletion of your account and data.
• Export: Where feasible, you can export your learning data.
• Withdraw consent: You may withdraw consent (some features may be impacted).

8. Data Retention

We retain data while you use the App. If you delete your account, we will delete data within a reasonable time, subject to legal requirements.

9. Children's Privacy

The App is not intended for children under 13. We do not knowingly collect personal information from children under 13. If we learn such data was collected, we will delete it.

10. Changes to This Policy

We may update this Policy from time to time. Material changes will be posted on this page and/or in the App.

11. Contact Us

12. Consent

By using the App, you consent to this Privacy Policy. If you do not agree, please stop using the App.