Privacy Policy for Text Alchemy

Privacy Policy

Last updated: December 26, 2025

This Privacy Policy describes how Text Alchemy (萬文煉金術) ("we", "us", or "our") collects, uses, and shares information when you use our mobile application (the "Service").

By using the Service, you agree to the collection and use of information in accordance with this policy.

Definitions

• Application: Text Alchemy (萬文煉金術), the mobile app provided by us.
• Service: The Application and all its features.
• Personal Data: Any information that relates to an identified or identifiable individual.
• Usage Data: Data collected automatically, either generated by the use of the Service or from the Service infrastructure itself.
• Device Information: Information about your device including device model, operating system, and identifiers.
• User Account: Your registered account that allows you to access personalized features and sync data across devices.

Core Service Principle

What Text Alchemy Does: Text Alchemy is an AI-powered language learning app that analyzes text you submit to provide vocabulary, grammar, and cultural insights. To provide these features, we process your submitted text using AI services and store your learning data in the cloud for synchronization across your devices.

What We Collect

Data You Provide to Us

• Account Information: Email address when you create an account or sign in via OAuth providers (Google, Apple, etc.)
• Text Content: The text you submit for analysis (articles, lyrics, dialogues, etc.)
• Learning Data:
  • Vocabulary and grammar items you bookmark or pin
  • Your practice session results and progress
  • Custom edits you make to AI-generated explanations
  • Your text library and organization preferences
• Subscription Information: Subscription plan, payment status, and usage limits (managed through RevenueCat)

Data Collected Automatically

Device and Advertising Information

• Advertising Identifier: Android Advertising ID or iOS IDFA (Identifier for Advertisers) for serving advertisements to free users
• Device Information: Device model, operating system version, app version, and language settings
• Usage Data: Features used, deep analysis count, practice session frequency, and time spent
• Diagnostic Data: Crash reports and error logs to improve app stability

Data Storage

Your data is stored in the cloud using Supabase services to enable:

• Cross-device synchronization: Access your texts, vocabulary, and progress on any device
• Backup and recovery: Protect your learning data from device loss
• Account management: Secure authentication and account settings

How We Use Your Data

• Provide Core Features:
  • Analyze text using AI to generate vocabulary, grammar, and cultural explanations
  • Store and organize your text library
  • Track learning progress and practice results
  • Sync data across your devices
• Manage Subscriptions: Process subscription plans, enforce usage limits (5/30/250 deep analyses per month based on your plan), and provide premium features
• Display Advertising: Show advertisements via Google AdMob to support the free app
  • Free users see ads at key interaction points
  • Premium and Premium+ subscribers enjoy an ad-free experience
  • In the EEA/UK and regions with privacy regulations, we request consent using Google's User Messaging Platform (UMP)
  • If you do not consent or deny tracking, we show only non-personalized ads
• Improve the Service: Analyze usage patterns, fix bugs, and develop new features
• Customer Support: Respond to your inquiries and provide technical assistance
• Legal Compliance: Comply with applicable laws and enforce our terms

Third-Party Services

Our app uses the following third-party services:

1. Supabase (Backend Infrastructure)

• Purpose: User authentication, cloud database, data synchronization, and backend services
• Data Processed: Email address, user ID, submitted text content, learning data, preferences, subscription records
• Data Location: Servers located in ap-southeast-1 (Singapore) region
• Privacy: Supabase Privacy Policy
• Security: Row Level Security (RLS) ensures users can only access their own data

2. AI Analysis Service (POE API - Gemini 2.5 Flash Lite)

• Purpose: Analyze submitted text to generate vocabulary, grammar, and cultural explanations
• Data Processed: Text content you submit for analysis
• Privacy:
  • We do not use your submitted text to train AI models
  • Text is processed for analysis purposes only
  • Refer to POE Privacy Policy

3. Google AdMob (Advertising)

• Purpose: Display advertisements to free users to support the app
• Data Collected: Advertising ID/IDFA, device information, ad interaction data
• Who Sees Ads: Only free users. Premium and Premium+ subscribers have an ad-free experience
• Privacy: Google's Privacy & Terms
• Consent:
  • In EEA/UK, we use Google User Messaging Platform (UMP) to request consent
  • You can manage consent through app settings or the privacy options form
  • Non-personalized ads are shown if consent is denied

4. RevenueCat (Subscription Management)

• Purpose: Manage in-app subscriptions across iOS and Android platforms
• Data Processed: User ID, subscription status, purchase transactions, entitlements
• Privacy: RevenueCat Privacy Policy
• Payment Processing: Actual payment is handled by Apple App Store or Google Play Store, not by us or RevenueCat

5. App Tracking Transparency (iOS)

• Purpose: Request permission to track users across apps and websites (required by Apple for iOS 14.5+)
• Usage: Used for personalized advertising via AdMob
• Control: You can deny tracking permission; we will show non-personalized ads instead

Note: We do not use general analytics platforms. Usage data is collected only for subscription management and app improvement purposes.

Data Sharing

We do not sell, rent, or trade your Personal Data with third parties, except:

• Service Providers: Third-party services listed above (Supabase, AI providers, AdMob, RevenueCat) that help us operate the Service
• Advertising Partners: Google AdMob may access advertising identifiers and device information to serve ads (free users only)
• Legal Requirements: If required by law, regulation, legal process, or governmental request
• Safety and Security: To protect against fraud, security threats, or illegal activities
• Business Transfers: In connection with a merger, acquisition, or sale of assets (users will be notified)

We do not sell your Personal Data.

Your submitted text and learning data are not shared with third parties except for AI analysis purposes.

Data Retention

• Account Data: Retained as long as your account is active or as needed to provide services
• Learning Data: Stored in the cloud until you manually delete it or close your account
• Subscription Records: Retained according to RevenueCat's policies and legal requirements (typically for tax and accounting purposes)
• Advertising Data: Managed by Google AdMob according to their retention policies
• Diagnostic Data: Retained for a limited period to debug issues and improve stability

Account Deletion: If you delete your account, we will delete or anonymize your personal information within 30 days, except where we are required to retain it for legal, tax, or accounting purposes.

Your Privacy Rights and Choices

Account Management

• Access Your Data: View and manage your account information, texts, and learning data within the app
• Edit Content: Modify or delete your submitted texts, vocabulary lists, and custom notes
• Export Data: Export your texts and learning records via the export function in Settings
• Delete Account: Contact us to request account deletion (all data will be removed within 30 days)

Advertising Preferences

• Upgrade to Premium: Premium and Premium+ subscribers enjoy a completely ad-free experience
• Android: Go to Settings → Google → Ads → Reset advertising ID or Opt out of Ads Personalization
• iOS: Go to Settings → Privacy & Security → Tracking → Disable "Allow Apps to Request to Track"
• iOS (Ad Personalization): Go to Settings → Privacy & Security → Apple Advertising → Disable "Personalized Ads"
• EEA/UK Users: You can manage consent via the privacy options form (accessible through deep link or settings)

GDPR Rights (EEA/UK Users)

If you are in the European Economic Area or United Kingdom, you have the right to:

• Access: Request a copy of your personal data
• Rectification: Correct inaccurate or incomplete data
• Erasure: Request deletion of your data (right to be forgotten)
• Restriction: Request restriction of processing
• Data Portability: Receive your data in a structured, machine-readable format
• Object: Object to processing of your data
• Withdraw Consent: Withdraw consent at any time (for consent-based processing)
• Lodge a Complaint: File a complaint with your local data protection authority

CCPA Rights (California Users)

If you are a California resident, you have the right to:

• Know: Request disclosure of personal information collected, used, and shared
• Delete: Request deletion of personal information
• Opt-Out of Sale: We do not sell personal information
• Non-Discrimination: We will not discriminate against you for exercising your rights

To exercise these rights, please contact us at: less.is.more20250521@gmail.com

Children's Privacy

Our Service is not directed to children under 13 years of age (or 16 in the European Union). We do not knowingly collect Personal Data from children under these ages. If you are a parent or guardian and believe your child has provided us with Personal Data, please contact us immediately. If we become aware that we have collected Personal Data from a child without verification of parental consent, we will take steps to remove that information from our servers.

We configure AdMob to comply with COPPA (Children's Online Privacy Protection Act) and do not show personalized ads to children.

Security

We take security seriously and implement industry-standard measures to protect your data:

• Encryption: Data in transit is encrypted using SSL/TLS protocols
• Authentication: Secure OAuth authentication via trusted providers (Google, Apple, etc.)
• Access Control: Row Level Security (RLS) in Supabase ensures users can only access their own data
• Secure Storage: Data stored on secure cloud infrastructure with regular backups
• Regular Updates: We regularly update our systems and dependencies to address security vulnerabilities

However, please note that no method of transmission over the Internet or electronic storage is 100% secure. While we strive to use commercially acceptable means to protect your Personal Data, we cannot guarantee its absolute security.

International Data Transfers

Your information may be transferred to and maintained on servers located outside of your country, state, or other governmental jurisdiction where data protection laws may differ.

• Primary Data Location: Supabase servers in Singapore (ap-southeast-1)
• AI Processing: Text may be processed by AI services in various locations
• Advertising Data: Google AdMob may process data in various countries

By using the Service, you consent to the transfer of your information to countries outside your country of residence, including countries that may not have the same data protection laws as your jurisdiction.

For EEA/UK users, we ensure appropriate safeguards are in place for international data transfers, including:

• Standard Contractual Clauses approved by the European Commission
• Adequacy decisions by the European Commission
• Other legally approved transfer mechanisms

Changes to This Privacy Policy

We may update our Privacy Policy from time to time. We will notify you of any changes by:

• Posting the new Privacy Policy in the app
• Updating the "Last updated" date at the top of this policy
• Sending you an in-app notification or email (for material changes)

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

Continued use of the Service after any modifications to the Privacy Policy will constitute your acknowledgment of the modifications and your consent to abide by the updated policy.

Contact Us

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

Email: less.is.more20250521@gmail.com
App Name: Text Alchemy (萬文煉金術)

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Summary

What You Should Know

• ✅ Cloud-based learning - Your texts and learning data sync across devices via secure cloud storage
• ✅ AI-powered analysis - Text you submit is analyzed by AI to provide language insights
• ✅ Account required - Sign in with email or OAuth (Google, Apple) to access cloud features
• ⚠️ Free users see ads - We display advertisements via Google AdMob to support the free app
• ⚠️ Data collection - We collect email, submitted text, learning data, and advertising IDs (free users)
• 💎 Premium is ad-free - Premium and Premium+ subscribers enjoy a completely ad-free experience
• 🔒 Secure storage - Row Level Security ensures you can only access your own data
• 🗑️ Full control - Export your data, delete content, or close your account anytime
• 🌍 Cross-platform sync - Access your learning on iOS, Android, or any device

Subscription Plans

• Free: 5 deep analyses per month, see ads
• Premium: 30 deep analyses per month, ad-free experience
• Premium+: 250 deep analyses per month, ad-free experience