Privacy Policy

Introduction

DejaVocab ("we", "our", or "the service") respects your privacy and is committed to protecting the personal information you provide when using our website (dejavocab.com), mobile applications (iOS and Android), and Chrome extension. This Privacy Policy is intended to inform you about the types of information we may collect and how we use this information.

Information Collection

Information We Collect

When you use DejaVocab services, we may collect the following types of information:

• Account Information: When you register an account, we collect your username, email address, and password (stored encrypted).
• Learning Data:
  • Words you save and their definitions
  • Video sentences you mark and their translations
  • Videos you save and their metadata (URL, title, platform info)
  • Video subtitles and timestamps
  • Phrases you learn and their context
  • Grammar analysis results
  • Documents you read (PDF, EPUB) and reading progress
  • Podcast listening records and subtitles
  • Locally imported video and audio file information
• Session Data:
  • Login session information (start and end times)
  • Activity records during the session
  • Chat session content and related settings
• Usage Data: We record your activities on the platform, such as:
  • Login and logout times
  • Video viewing records
  • Subtitle saving operations
  • Word lookup records
  • Sentence adding activities
  • Extension usage
  • Podcast listening records
  • Document reading progress
  • Phrase learning records
  • Credit usage
• Device Information:
  • IP address
  • Browser type and version
  • Operating system
  • Device type (desktop, mobile, or tablet)
• Usage Metrics: To improve our service, we track:
  • Login count
  • Number of saved videos
  • Number of favorited words
  • Number of saved sentences
  • Number of phrases learned
  • Number of documents read
  • Last active time
  • Credit usage statistics
• Subscription and Payment Information:
  • Subscription type (Free, Premium, Ultra, Lifetime)
  • Apple App Store or Google Play transaction information
  • Subscription start and expiration dates
  • Credit allocation and usage records
  • Lifetime member number (if applicable)
• User Source Survey:
  • How you learned about DejaVocab (e.g., Xiaohongshu, Bilibili, friend referral)
  • Your learning goals

Information Collected by Mobile Apps

Our iOS and Android apps collect the following information:

• Words and sentences you select from YouTube and Bilibili videos
• Podcasts you listen to and their subtitles
• EPUB/PDF documents you read and reading progress
• Local video and audio files you import
• Video/audio subtitle content and timestamps
• Your app settings and preferences
• Subscription status and credit usage
• Device information (for cross-device sync)

Information Collected by Chrome Extension

Our Chrome extension collects the following information:

• Words and sentences you select from YouTube videos
• Metadata of videos you are watching (title, URL, platform type)
• Video subtitle content and timestamps
• Your extension settings and configuration
• Activity records during extension usage

Our apps and extensions will NOT:

• Monitor or collect all websites you visit
• Read or collect your browsing history
• Access or collect data without your authorization
• Share your personal data with unrelated third parties
• Access other files on your device (except content you actively import)

Information Use

We use the information we collect to:

• Provide Core Features:
  • Store and manage your learning materials (videos, subtitles, words, sentences, phrases)
  • Provide word definitions and translation services
  • Support video, podcast, and document learning and review features
  • Provide AI grammar analysis and learning suggestions
  • Sync learning progress across devices
• Personalize Your Experience:
  • Provide relevant recommendations based on your learning history
  • Save your learning progress and preference settings
  • Optimize content presentation
  • Adjust learning content based on vocabulary level
  • Recommend channels and podcasts suited to you
• Improve Our Services:
  • Analyze feature usage patterns to identify improvement opportunities
  • Diagnose technical issues
  • Develop new features
• Provide User Support: Answer questions and resolve issues
• Ensure Security: Prevent fraud and abuse
• Generate Aggregate Statistics: Understand overall usage (without personally identifiable information)

Information Sharing

We do not sell, rent, or trade your personal information to third parties. We may share your information in the following circumstances:

• Service Providers: We may share information with trusted third-party service providers who help us operate our services (such as hosting providers or analytics providers).
• Payment Processing: Subscription payments are processed through Apple App Store or Google Play; we do not directly store your payment card information.
• AI Services: To provide translation, grammar analysis, and other features, your text content may be sent to AI service providers (such as OpenAI, Google) for processing.
• Legal Requirements: We may disclose your information if required by law or to protect our rights.
• With Your Consent: With your explicit consent, we may share your personal information with third parties.

Data Security

We take reasonable technical and organizational measures to protect your personal information from unauthorized access, use, or disclosure. These measures include data encryption, secure access controls, and regular security assessments. However, please note that no method of transmission over the Internet or electronic storage is 100% secure.

Your Rights

Depending on the data protection laws applicable in your region, you may have the following rights:

• Access your personal information
• Correct inaccurate information
• Delete your personal information
• Restrict or object to processing of your personal information
• Data portability

To exercise these rights, please contact us through the following contact information.

Cookie Usage

We use cookies and similar technologies to improve user experience, remember your preferences, and analyze website usage. You can control the use of cookies through your browser settings.

Children's Privacy

Our services are not intended for children under 13 years of age. We do not knowingly collect personal information from children under 13. If you are a parent or guardian and believe that your child has provided us with personal information, please contact us and we will take steps to remove such information from our systems.

Privacy Policy Updates

We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new version on our website. We recommend that you review this page periodically for the latest information. Your continued use of our services will be deemed as acceptance of any modified Privacy Policy.

Contact Us

If you have any questions or comments about this Privacy Policy, please contact us through: